Venice Italy Highlight
Make sure you try currywurst in Germany. It's basically a hot dog with tomato sauce (ketchup) and curry powder. Tastes brilliant and only costs 1 or 2 Euro.
State Street is where the party happens. The University of Wisconsin student body is one of the most nightlife crazy in the nation...
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.