My advice would be to do as many excursions as you can. They are a great way to get to know your group, and they are always good fun.
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!
If you love live music, Memphis and New Orleans are two places to see raw, unpretentious blues, jazz, funk, and R&B. Many times, you can see these bands for free!