Besides being one of the most awesome (and alas touristy) old cities in Europe, Bruges is home to three (according to belgium.beertourism.com) tasty breweries as well. The Bourgogne des Flandres brewery backs on to the Dijver river on the south side of the old centre. On the website, their beer is described as a 'red-brown ale' (the English translation obviously), although I remember it being fairly dark but not at all heavy - alcohol content is 5% - with a lovely tangy finish to the richer darker malty side.