We're traveling with another couple to Europe In Early May, landing in Munich early on May 7. We're looking at 4 days in the Munich area with driving trips to Dachau, Berchtesgaden, Garmish / Zugspitz, and Munich itself.
We fly out of Amsterdam on May 20th after spending probably four days in the area, with side trips to area sites and perhaps Antwerp.
We're stuck about the middle, and have discussed Vienna/Bratislava, Budapest, and Prague as possibilities. Travel will be by train, except for the leg to Amsterdam. We are trying to plan as few hotels as possible, but other than that there are few restrictions.
This will probably be our only visit to this part of Europe for a few years so wanted some thoughts on the "must sees".