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Just buy the Lonely Planet Guide to Europe (or western Europe if you aren't going east). It will tell you all sorts of hostels/hotels to stay at and sights to see, and you don't have to plan anything in advance. Just read it on the train while en route to your next destination.

I would also recommend adding in Prague between Berlin/Munich. Amazing city, wasn't destroyed during the war, and you can see a little bit of Eastern culture while you're there. It's cheap as [censored] and the eastern european women are leaps and bounds hotter than anyone in the west. The Eurail pass doesn't work in Czech though so you'd have to buy tickets from the Czech/German border to Prague though.