Here's a link to my post-cruise review. We did the full Grand Danube, so Vilshofen to Budapest is the first half. I was surprised @CastleCritic didn't post a link to his excellent day by day review, but then realized he did the second half Budapest to Bucharest. But I'll link it below also since you are going on AmaMagna.   To answer your questions directly: Passau - If you've never been there before, can't go wrong with the city walk. It's a neat place to see and tour.
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