ns_girl

Hi everyone, Newbie poster here!
Been lolling around the site for ages,
you guys are awesome.

Im heading over to Berlin on July 8th.
Im staying with a friend in Potsdam (just south of berlin),
for 3 weeks . Its my first time in Europe (im 17)
She keeps asking me what I want to do when I come over..
and I've read countless articles and watched countless video's giving me the tourist-y attractions to see. (brandenburg gate, castle sansoucci, etc.. i know about that stuff)
but my question is,
from you t-punkers and yout experiences,
what are the must-see's in Berlin?
any where that is relatively close to Berlin?
and also Prague, because im spending a few days there as well.
Clubs? Random places? Places with an awesome view? A cool museum?
anything really.
She said she would take me anywhere that is a few hours or less from Berlin,
and Im just not sure whats worth seeing......