We went up the Danube this summer. On a big boat, a river boat. Basically, two state rooms plus a hallway wide and bunches long. Flat bottomed, quiet, stable as in "not rocking around" and like a little hotel on the river.
We traveled from Budapest to Prague, sort of, not quite reaching Prague but getting pretty close. It was an interesting experience and something I'd do again.
The nice thing about a river cruise is that you can drop you stuff off in your room when you arrive and you don't have to pack up and leave until the trip is over. That was a great plus over other kinds of tours where you move every few days or so.
If it's Tuesday it must be Brussels!
Every day you stop at little towns along the river and get to spend a day wandering around looking at the sights. Mostly the sights are castles, things, more things, museums, things, more things and RESTAURANTS, my favorite! I found that after 15 minutes of looking around I was ready for a coffee, pizza, beer or all three. That was usually possible. There was nothing better than sitting in a cafe in the shade enjoying a coffee and watching the other tourists scurry around in the sun looking at "stuff" they wouldn't possibly remember once they got home.
"Oh, look, Alice, this a picture we took of something somewhere and it's Very Old and, Oh, look Alice this is another picture of the same thing we took two seconds later. Somewhere, I don't remember, but it's European, right?"
I contented myself taking pictures of young women in short skirts. I figured, in the scheme of things over time, that my pictures of young women in short skirts would trump pictures of something old taken somewhere sometime.