easiest thing to do is to go on the 3 hour free walking tour, and then you'll know pretty much what else you need to see at a slower pace and more at detail
other than that,
1, walk around the Hackeschemarkt and Oranienburger street area.(fun at night too..pub crawl is at Oranjenburger str.) There are lots of underground and high end artists there. fun vibe and lots good restaurant near the old post office.
2, do take a day and go to Potsdam and visit the Sanssouci palace.
Berlin is my favorite German city, have fun there!
Last edited by riceballrox (4-14-2012 1:30 PM)