Bon Voyage!

I'm dying to go to Europe.  We haven't booked our flights yet, but the planning has begun, and it can't get here soon enough!  The hardest part is picking where to go and see while we are there.  We are going to go for 3 weeks and celebrate 5 wonderful years together in early 2013.  Here is what we are thinking: 

London >> Brussels >> Amsterdam >> Munich >> Prague >> Venice >> Florence >> Rome >> Paris

SO.... If you've been, tell me your favorite places.  What food/cafes/towns/cities/tours/etc did you love?