I don't have much to say about Brussels even though it is often referred to as the Capital of Europe due to its status as the seat of the European Union. As a tourist destination, it can't begin to compare with Paris, Madrid, Rome, Prague or Berlin. However it can certainly compete in the culinary sphere and in my opinion has some of the best restauruants in all of Europe. Its seafood is especially good and it has better options for French food than one can readily find in Paris.
Belgium's top tourism destination is the ancient trading city of Bruges(http://en.wikipedia.org/wiki/Bruges) which we visited over the past weekend. As a canal city, we prefer it to Amsterdam because it is much less crowded and the bicycles are much less threatening.