What is your arrival and departure day? Will you be arriving airport in Amsterdam and departing Brussels airport? If not that is a lot of backtracking for a short 7 day trip.
One week, imo is one country— after you travel a lot, you will understand.
But if you’re are set on seeing both Amsterdam and Brussels let us know… and is it Brussels or do you mean Belgium—Bruges is much more interesting than Brussels to a lot of people…
Here is an idea to get you started:
Day 1 arrive: check in and take local train to Amsterdam. See Ann Frank House and then in evening do a boat tour if you arrive early enough.
Day 2: , see Zaanse Schans OR see the Rijksmuseum art museum (we liked the semi private tour of the museum and since we don’t know much about art we learned a great deal!) OR Maybe see Our lord in the attic and Rembrandts House- a great little Museum in his original house which was as interesting as his collection of things which kids would enjoy. (You can see how two more days would be nicer!)
Day 3: Depart for Bruges. Stay in Bruges for two nights and enjoy this cool medieval town, starting with a horse drawn carriage ride in the evening— especially nice when the crowds leave in the evening. Take a boat tour
Day 4: see Bruges… sleep Bruges
Day 5: depart and take short train to Brussels. Sleep one night Brussels and see the main square at night. This is the most amazing square in all of Europe and must be seen at night! The one place that I would say is worth just a one night stay— (I have recommendations for a budget hotel on the square with the most amazing view of the square and walking distance from the train station with luggage-a very easy one or two night stay!)
Day 6: Depart to Amsterdam airport…Sleep near airport.
Day 7: Flight departure