Ideas for Travel?

If anyone has any ideas for where to go in Europe during June I would love to hear it. My plan, as of right now, is to Land in Paris (with my brother), stay there for a day or two then take a train through Germany to Prague. We'll stay there for a while, then go down to Venice, and Rome if time and money permits. We might also go to Greece instead of Rome but I haven't talked it over completely yet with my brother.