The jungles and monsoon forests of Vietnam are diverse ecosystems that are alive with unique wildlife. Trekking is a popular activity here, particularly the mountains of Sapa and the primeval landscape of Cuc Phuong National Park. For a more urban escape, take a guided food tour of Ho Chi Minh City, making sure to squeeze in visits to the historic Hoi Truong Thong Nhat palace and the intricately adorned Emperor Jade Pagoda.

The biggest island in the Philippines, Luzon is also one of the most diverse—it’s where mountain peaks and volcanoes meet miles of coastline, and indigenous culture melds with Spanish colonial history. You can relax at the beach in Pagudpud, hike with locals up the Batad Rice Terraces, ride in a horse-drawn carriage in Vigan, and snack on street food and dance the night away in Manila. You’ll need a few days and a bus pass, but you’ll be glad you stayed.

With more than 7,000 islands consisting of rice paddies, volcanos, mega-metropolises, world-class surf spots, and endemic wildlife, the Philippines is one of the most dazzling and diverse countries in all of Asia. Not to mention, it’s home to some of the world’s best beaches, too.

Known by a flotilla of aliases, the Resplendent Isle is one of gorgeous beaches, tea plantations and ancient cities. Scuba dive, visit an elephant orphanage and a lagoon of singing fish, explore dense jungle, shrines and temples. Situated just 20 miles off India, the island formerly known as Ceylon is home to 20 million people and eight World Heritage sites. The country's long, brutal civil war ended in May, 2009, bringing peace, stability and a revival of tourism.

Set your own pace by cycling through Khmer ruins at Angkor Wat or pedaling the banks of the mighty Mekong. Trek off the beaten path on eco-adventures through the Cardamom Mountains, southern tropical islands or crater lakes of the remote northeast. Add urban adventure and hire a "motodop" taxi in Siem Reap.

Thailand’s largest island is an international magnet for beach lovers and serious divers, who enthusiastically submerge themselves in the Andaman Sea. Blue lagoons and salmon sunsets make for a dream-like atmosphere, and indeed, a vacation here can feel a bit surreal. Watersports are the most popular activities, though once you’ve had enough sun there’s still plenty to explore at the island’s aquariums, gardens, and Buddhist temples.

In the Land of the Rising Sun, ancient temples sit alongside neon wonderlands and shinto shrines offer pockets of peace amid metropolises. Add tea ceremonies, snow monkeys, sushi, kimonos, and karaoke to the mix, and you’ve got one of the world’s most fascinating countries.

Want to make your co-workers insanely jealous? Just casually drop "I’m vacationing in the Maldives this year" into conversation, preferably in the dead of winter. Or better yet, go there without mentioning it to anyone—then send them a "Wish you were here!" postcard.