Germany is so much fun. If you're near Munich you have to go to the Hofbrauhaus (although I'm sure you've been told that) When I was last in Europe I spent most of my time in Austria, but I was in Munich, a little town called Prien, and Hohenschwangau for a while.
Anyway yeah like everyone said drink a lot of beer, go to beer gardens, and don't forget to balance time between being in the city and being in the country, because the scenery is fucking amazing.
Also, if you'd like to see something historical, maybe you could see if you could go to Hitler's Nest (Berchtesgaden), I wanted to go but couldn't.
Oh yeah, another thing you could see is the Neuschschwanstein castle in Hohenschwangau. It's pretty famous and the town is pretty nice too.
Have fun. And really don't forget to drink a lot of beer.