tips for Berlin (Mannheim)

Hi there
I am going to Berlin in few weeks with some girlfriends from italy. They will take care about the cultural part of the trip and they expected me to take part of the "fun part". And here I am asking your help. Do you have some suggestions where to go for example to eat, to dance ot to take a nice walk and so on? Or where NOT to go. In many cities in Germany, there is a monthly magayine where it is written day by day what's running in the city, do you know the name of this magazine in Berlin.
Any tips are welcome, thank you