Ich bin ein Berliner (in Off-topic)

Well, sort of. I'll be in Berlin next week. From Thursday until Saturday I'll be at the Linuxtag, a large Linux fair/congress, but Sunday (Friday and Saturday evening as well) I've reserved to discover some of Berlin. My hotel is at the Kurfürstendamm, so I've already got that part covered. What other must-see places are there in Berlin? Of course there's the Wall (what's left of it), but I'm worried those spots are a bit too touristic (I'd like to leave my Hawaii shirt at home...:).

Der Reichstaag!

My favorite place to eat while in Berlin is called Schwarzwaldstuben. The pizza there is delicious. Also try the Linsen, Spätzle und Saitenwürstchen! I'll put together a list of places you should go while in Berlin.