A tip for people looking for a decent coffee shop.. if you don't already know about it, you will because most Contiki travellers find out about it - its The Grasshopper. Ask a local and they should be able to tell you where to find it.
If you visit the massive outdoor club Rio, also go next door to the 'Green Pardon' which is much cheaper, and has about 5 bars and three separate dance floors - all outside. Party till the sun rises!
German beer is all organic so you cant get hang overs - I dare you to test it! ;D
FYI - make sure you have cash ahead of time because they don't take plastic and there isn't an ATM in sight!