What are the best places to travel in europe this summer 2009?

Starting the trip off in geneva, and looking to go to germany possible austria and maybe parts of eastern europe.. 4 of us are students so budget is tight, but also looking to have fun i.e if they're any good festivals or cheap gigs going on. We're only travelling for 10 days so we're looking to see the best of the best. Heat factor and train prices will also be a factor

Any reccommendations please post in yahoo?
http://answers.yahoo.com/question/index;_ylt=AvgAg__n_0cluknqfRk7gf8jzKIX;_ylv=3?qid=20090701115511AAYFcrn