U.S. News Insider Tip: For a low-effort wow moment, drive past Waimea Canyon in Koke'e State Park and stop at the Kalalau Lookout for a glimpse of the glorious Napali Coast and Kalalau Valley some 4,000 feet below. – Jill Schildhouse

The Napali Coast is a 17-mile expanse of rocky, steep and oh-so-gorgeous cliffs that stretch along Kaua'i's North Shore. Travelers agree there's no better way to experience Kaua'i's natural beauty and eye-catching terrain than at Napali, so you should make plans to marvel at it – either on foot, from the water or from the air (there are no roads that go along the Napali Coast).

U.S. News Insider Tip: Arrive early to get a parking spot, or between 11 a.m. and noon (after the early birds have finished their hikes). Then, refuel at the delicious nearby taco spot, Island Taco. – Erin Evans, Managing Editor

Waimea Canyon, aptly nicknamed the "Grand Canyon of the Pacific," should be at the top of every traveler's itinerary. This massive gorge – which measures 14 miles across, a mile wide and 3,600 feet deep – is awash with spectacular scenery difficult to find elsewhere on the Hawaiian Islands. Here, you'll see craggy red cliffsides and crested buttes blanketed in lush, evergreen vegetation as far as the eye can see, with waterfalls dotted in between. Many travelers who visit Waimea Canyon choose to take in the sight by car, as there are multiple lookout points situated along Koke'e Road, including the popular Waimea Canyon and Puu Hinahina lookout points. 

U.S. News Insider Tip: It's common to see Hawaiian monk seals sleeping and sunning themselves in the sand; do not be alarmed, they are perfectly OK. Be sure to stay 100 feet away from these endangered creatures (you can still get some great photos). – Jill Schildhouse

Po'ipu Beach Park is popular with both residents of and visitors to Kaua'i. This small shoreline situated on the south side appeals to many types of beachgoers thanks to its golden sands, calm waters and convenient location in the heart of the Po'ipu resort area. Here, sun seekers can easily kick back, relax and lay out for hours in between the palm trees while those with children needn't worry about big waves interrupting a family swim. Those looking for a little more adventure can enjoy bodyboarding (the beach features small waves) and snorkeling.

Princeville Botanical Gardens began as a passion project of Bill and Lucinda Robertson, who have been cultivating former cattle land and reintroducing native flora since 2004. In 2010, they opened their gardens to the public for small private tours. This attraction on the island's North Shore contains hundreds of plants including a diverse array of rare and endangered flowers, fruit trees and plants with medicinal properties. It has both native plants and flora from around the world. The gardens also produce honey from its on-site beehives as well as organic chocolate.

The variety of plants consistently impresses visitors, who typically call the gardens very beautiful and the tour educational and entertaining. Guides win high marks for their professionalism and insight. And the food samples offered along the way are heartily appreciated.

Many people come to Kaua'i with high hopes of backpacking the 22-mile round-trip Kalalau Trail. This trail is so popular because it is the only land-based option to explore the world-famous Napali Coast. No roads or paved streets go along, in or through this famous coastline.

The hike takes travelers through five valleys in Napali Coast State Wilderness Park, passing through lush tropical forests, bubbling streams, cascading waterfalls and dramatic cliffside ocean views. What's more, the hike ends at the remote Kalalau Beach. But access to this unworldly scenery comes with a price. Novice hikers, expert expeditioners, the Hawaii Tourism Authority and state officials all say the same: This hike is a lot of work and shouldn't be attempted without the proper equipment and, most importantly, experience. The trail is filled with elevation and terrain changes throughout. Trails are not wide and open, but rather narrow, rocky and very muddy. And once you hit Crawler's Ledge around mile 7, the dirt path starts to disappear and the rock climbing – or rather clinging – begins.

U.S. News Insider Tip: If you're lucky enough to visit Wailua Falls when locals are selling homemade banana bread out of the back of their trucks, be sure to have cash on hand to buy a loaf – it's the most delicious bread you've ever tasted. – Jill Schildhouse

If you want to experience Kaua'i's majestic rainforests without breaking too much of a sweat, then you'll want to add Wailua River State Park to your itinerary. This park on the eastern coast of the island is home to the only navigable river in Hawaii, allowing visitors to get an eyeful of the lush valley on a boat tour.

U.S. News Insider Tip: Snapping a photo on Hanalei Pier is sure to yield a gorgeous shot, but standing under the pier when the tide is low makes for a really cool architectural image with an unexpected vantage point. – Jill Schildhouse

Hanalei Bay is located 4 miles southwest of Princeville, one of the island's premier resort areas, on Kaua'i's North Shore. Hanalei Bay is composed of three different beaches: Wai'oli Beach Park, Hanalei Beach Park and Black Pot Beach, the latter of which is sandwiched between the historic Hanalei Pier and the mouth of the Hanalei River. Lifeguards can be found at multiple points along the beach and bathroom facilities are also on-site. Keep in mind that there will be signs along the beach indicating water conditions and if it is safe to swim. If you're ever unsure, talk with a lifeguard.

If you're looking for a place to snorkel in Kaua'i, head to Tunnels Beach (aka Makua Beach). Tunnels Beach is located on Ha'ena Point on Kaua'i's North Shore near Wainiha, about 2 miles east of the Kalalau Trail and 9 miles west of Princeville.

The beach offers an expansive reef that is suitable for both novice and experienced snorkelers. Its name refers to the lava tubes, or tunnels, that run through the reef. Travelers can expect to see batches of coral, small sea caves and tunnels as well as wildlife, which could include turtles, plenty of tropical fish, eels, crabs and more. If you're not up for snorkeling, visitors say this beach is still worth a trip for its fantastic location. Here, the water is clear, palm trees abound and if you look toward the west, you can admire the cluster of lush, jagged peaks that flank the beach. 

U.S. News Insider Tip: Even when it's raining elsewhere on the island, the beaches around the Poipu area are often sunny and dry. If soggy weather ruins your plans on the north, west or east sides of Kaua'i, head south for near-perfect conditions. – Jill Schildhouse

The moment you drive through the iconic mile-long tunnel of eucalyptus trees on Maluhia Road, you know you've arrived on the beautiful South Shore of Kaua'i. There's plenty to see and do here — this is where you'll find Poipu Beach Park and Old Koloa Town, which could easily take up a full day for anyone who wants some quality beach time, followed by a meal and shopping.

Despite its close proximity to the airport, cruise port and multiple hotels, travelers maintain Kalapaki Beach is a relaxing spot. The beach is located on the west side of the island in Lihue, an area known for gentle swimming conditions and easy access to amenities. Kalapaki is an especially swimmer-friendly shoreline because of the nearby Nawiliwili Bay, which features a jetty and breakwater that slow big waves. As such, this won't be the most exciting surf spot, but rather the perfect place for a relaxing dip or an afternoon of paddleboarding. And thanks to its location right in back of the popular Marriott's Kaua'i Beach Club, travelers are steps away from eateries, shops on Rice Street and water sport rentals.

While recent visitors do agree that Kalapaki is perfect for a soothing afternoon under the sun, some said that when cruise ships are in port, the beach does experience more visitors. And although this beach is backed by a Marriott property, it does not have lifeguards, so be mindful of conditions and don't swim at night. There are no set hours for Kalapaki Beach and it is free to visit, even if you aren't a Marriott guest. For more information on Kalapaki Beach, visit the Hawaii Tourist Authority's website.

Ke'e Beach (pronounced Keh-AY), which is located within Ha'ena State Park, is conveniently situated at the Kalalau trailhead, offering beachgoers sweeping views of the Napali cliffs from the comfort of the sand. Plus, there are lifeguards posted here and, depending on the time of year, it is safe to swim and snorkel, so long as you keep close to the shore. The beach also offers restrooms and showers, though due to its close proximity to the cliffs, there is no cell phone service.

Because of its stunning location on the island's North Shore, recent visitors couldn't help but fall in love with Ke'e Beach. Located at the start of the Kalalau Trail, this beach has been known to see considerable traffic. In response, the park has imposed daily visitor limits and requires advance reservations for entry.

When the conditions are calm during the summer, the North Shore's Ha'ena Beach Park is a popular spot for swimming and snorkeling – let the turquoise waters lure you right in. This beach is located on one side of the crescent-shaped Maniniholo Bay, and the other side is the popular Tunnels Beach. Those who prefer to lounge on the white sand beach will find myriad shells to examine and enjoy (remember to leave them where you found them instead of collecting them to take home, which can negatively impact the delicate ecosystem). However, take caution during the winter months; you will no doubt see experienced surfers riding the gigantic waves, but the surf and currents here can be quite dangerous for swimmers. Recent visitors note that the entire beach is taped off and the lifeguard station is closed when the waves are too intense, so be sure to mind those warnings.

You can access Ha'ena Beach Park off of Highway 560 at mile marker 9. Not to be confused with Ha'ena State Park (home of Ke'e Beach and the trailhead for the Kalalau Trail), Ha'ena Beach Park does not require advance parking reservations or an entry fee. However, recent visitors cautioned that parking is limited and that you'll need to arrive before 10 a.m. to score a spot.

Situated on Kaua'i's South Shore and 3 miles west of Poipu Beach, Allerton Garden encompasses bamboo groves, rainforest trees, fruit trees and other tropical plants, a flower garden and more. The garden also has vine-covered cliffs overlooking the ocean and a stream lined with fig trees. You may recognize parts of the garden from their appearances in movies like "Jurassic Park."

The lush garden doesn't fail to impress plant lovers. Visitors frequently laud the tour guides for their extensive knowledge about the garden's collection. Reviewers suggest wearing mosquito repellent and closed-toe shoes as parts of the garden can get quite muddy.

East of Princeville on Kaua'i's North Shore, Anini Beach features miles of white sand and a large coral reef. Due to its consistently calm waters, the beach is widely regarded by visitors as a great place to visit with children, despite the absence of lifeguards. (You may run into strong currents beyond the reef.) Because of these conditions, the beach is a destination for fans of water activities like paddleboarding and windsurfing. Its tranquil lagoon also makes it an ideal spot for novice snorkelers.

Beachgoers regularly describe Anini Beach as a wonderful place for swimming, snorkeling or just relaxing. Many recommend it for those traveling with children.

Located on Kaua'i's South Shore, near Poipu Beach, the picturesque Old Koloa Town is the original sugar plantation-era shopping village in the town of Koloa. This home of Hawaii's first successful sugar mill was established in 1835, and each of the brightly colored buildings has a history worth noting. For instance, The Tao Building was first used as an ice cream parlor, serving the plantation workers. The Chang Fook Building was built in the 1920s and operated as a general store before becoming known for its baked goods. And the Koloa Hotel was used as lodging for the traveling salesmen who worked for large mercantile agencies on O'ahu.

Today, these buildings are filled with a wide variety of charming shops and restaurants. A stroll through this complex introduces visitors to storefronts filled with surf attire and beachwear, souvenir T-shirts and gifts, handcrafted goods and fine art galleries. Grab a shave ice at The Fresh Shave for a quick cooldown or a bite to eat at Kenji Burger, Koloa Pizza Kitchen + Bar or Leahi Vegan Eats.

The 203-acre Kilauea Point National Wildlife Refuge sits atop a 180-foot ocean bluff on the island's North Shore. In addition to ocean views, you may spot seabirds rarely seen from land, such as the Hawaiian state bird (the nene, or Hawaiian goose) as well as Laysan albatross (moli) and the red-footed booby. From December to May, you might also be able to see humpback whales cavorting in the water nearby. One of Kaua'i's top attractions, the 52-foot Daniel K. Inouye Kilauea Point Lighthouse, sits within the refuge.

Visitors consistently say this area offers unrivaled scenic views. Some recommend bringing binoculars to make the most of the ample bird-watching opportunities (though you can also use binoculars provided by the refuge). In addition to the helpful park rangers, reviewers also praised the signage posted throughout the refuge, which identifies the various bird species that can be found here. Many also encourage a stop at the gift shop.

Welcome to the art capital of Kaua'i, Hanapepe Town. Located on the southwest side of the island between Koloa and Waimea, this area has a rich history. Dubbed "Kaua'i's Biggest Little Town," it once brimmed with enlisted servicemen and sailors stationed here from World War I to the early 1950s. The historic buildings, which served as inspiration for the Disney film "Lilo and Stitch," house shops, eateries and more art galleries than anywhere else on the island.

There are a wide variety of artisans in Hanapepe, with designs and mediums to suit any taste or style. For instance, Kalakoa Kaua'i Fine Art Gallery features local artists who have mastered light, color and motion. Banana Patch Studio showcases hand-painted ceramic tiles and pottery. And Pu'uwai Gallery & Boutique sells locally crafted jewelry, art and clothing. Beyond the shops, the area also serves up a bevy of local eateries, including favorites like Midnight Bear Breads bakery, Longies Shave Ice and Treats and Kauai Kookie, which was founded in 1965.

Once home to 22,000 acres of sugarcane, this historic plantation in Lihue now spans 105 acres and offers visitors a glimpse at Hawaii's sugarcane history, which dates to the 1860s. Visitors ride mahogany-lined passenger train cars along the property's 2 ½ miles of railroad tracks, where bananas, mangos, papayas, pineapples, sugarcane, taro and other essential Hawaiian crops grow. Along the 40-minute ride, conductors provide narration regarding the various sights, which include animals like goats, pigs and sheep that you'll be able to feed during a stop.

Trip-takers generally describe this excursion as both fun and informative. They also say it's enjoyable for travelers of all ages. Interacting with the animals is frequently cited as a high point, as is the food included in the lunch tour.

While there are several luau options on Kaua'i, Luau Kalamaku at the historic Kilohana Plantation is known for its authentic experience in an open-air pavilion. Arrive early to peruse the more than 100-acre plantation and explore the open-air artisan market for handcrafted souvenirs held exclusively for guests. Be sure to listen for the blowing of the conch shell at 6:15 p.m., which signals the beginning of the ceremony.

At 6:30 p.m., attendees will dine on a buffet of dishes made from fresh local ingredients, including seasonal fruit, green salad, poi (taro root), teriyaki chicken, vegetable chow mein, sautéed vegetables, seasonal fish and the famous Kalua pork – this whole roasted pig is cooked in an underground oven called an imu, and wrapped in banana leaves. Leave room for the banana cream tart, pineapple upside down cake and coconut pudding for dessert.

As its name suggests, Kaua'i's Fern Grotto is a natural lava rock grotto covered in hanging ferns and tropical foliage. This special place was once the birthplace of the island's ali'i, or royalty, but it's now a popular locale for wedding ceremonies. The only way to get to this magical location, which sits on the south fork of the Wailua River on the eastern side of the island, is by boat.

The Smith's Kaua'i Fern Grotto tour begins with a leisurely, 2-mile open-air cruise along the river, during which you'll hear songs and stories of ancient Hawaii and be treated to a hula lesson with beautiful scenery. Upon arrival, you'll take a short nature walk through the rainforest full of native Hawaiian plants and around a serene space where the guides share history and culture all the way to the Fern Grotto. There's a waterfall along the way, providing a cooling mist. The acoustics here are so incredible that local musicians and entertainers are known to greet visitors with Hawaiian music.