Where in Germany should I visit?

[IceAgeComing]

I went to Berlin a few summers ago for a week after visiting my friend in Krakow; its a really nice place and I'd recommend it.  The only downside that I had was the fact that I was only really there for three days (one day was spent on a few trains; another coming home) and that wasn't really enough to see everything that I wanted to see and I never really got very far away from the bit around Alexander Platz which was where my hostel was - I went down to Tempelhof airport for a look around since someone mentioned it to me and that was it, although obviously that's now not going to be open to you.  Some nice pubs as well; although I can't really remember any names, for obvious reasons.

[IceAgeComing]

Visit Poland. It's no longer (partially) German, but I'd love to have you here.

depends where in Poland you're talking about there