We’re thinking of doing one here in the US. Don’t’know if I can find one with enough time for some CW battlefield exploration, but American crew for sure Those East Europe river cruises look great. We did Barcelona to Constantinople, mostly Greek and Philipino crew, converted Russian ‘Icebreaker’, about 600 people... nothing like those hideous floating cities, although I also see some people needing just to get away from everything for downtime rather than adventuring....
Have to hit Chattanooga and Vicksburg.
Rhine in the fall would be cool too.
Based on experience I recommend selecting a ship of minimum size 150,000 tons. You will have very little feel of ship’s motion.
American Queen, on the Mississippi. Loved it on my honeymoon! We bussed to Vicksburg but unfortunately, not much time to really experience it. Also, they don’t much want you out because of the damn fire ants everywhere. They ruin everything.