Brussels, Grote Markt, several gardens, try waffles, beers
Bruges, just get lost, great to wander around, do boat trip
Antwerp, diamonds, harbor, old town hall
Ghent, beautiful medieval town
The Ardennes, several great rivers to relax and wonder, lots of fun outdoor activities too, like kayaking and mountaineering.
Dinant, impressive split rock, high bridge and a fortress up on the mountain, very cool tour, go and see the totally skew (due to bombings) room.
Eat and drink: waffles, try some Belgian beers
