If you're coming over here to drink beer make sure you pop into Delerium which is just off the Grand place as they hold the world record for the most beers in one bar, over 2000 for you to chose from.
They also stock Leffe Vieille Cuvee, which is a must try if you already enjoy Leffe in it's most comon forms.
Oh and Leffe Biere de Noel has just been released for the festive season so grab it while you can.
So many good beers you can't go wrong.