We did the Rhine when my daughter was 13 and had a great trip! She really enjoyed it and wants to do it again, in fact. The ziplining was a big highlight. Lots of fun. We also did the indoor snow place, which again, was really fun, and the painting class in Amsterdam as well as visiting the little village and doing some crafts there. It was a good balance of seeing things and having activities that younger people enjoy.
She liked having the "teen" table at dinner. It actually ended up sort of split between two tables, one for older teens and one for younger teens and tweens. It was really nice having other kids on the trip. They spent a lot of time in the pool together and playing boardgames, that kind of thing. She also enjoyed the macaron making class. The guides were great with the kids. Your level of activity was really dependent on what you wanted to do. They also had trivia night, which was fun, and the guides gave talks some nights about their lives, which was surprisingly interesting. There was also a dance night with the spaghetti ice cream!
She did not like the organ concert, lol. That was pretty boring and a bit long for the kids, to be honest. She and some of the other kids were bummed that they were not allowed to use the jogging track to jog or the gym. Several were athletes trying to keep in shape over the summer and that was a bit of a disappiontment, though I understand wanting an age limit for those things.
It's very differet from a
Disney cruise, and honestly, I'm more of a
DCL person than I think a river cruise person, but I would definitely do it again.