I have problems with my knees, especially climbing stairs. I have been on 2 river cruises and over 30 ocean cruises. The river cruises were wonderful! First of all, there is always something to see. I enjoyed watching the castles, villages, nesting swans and other boats on the river go by. I would follow our location on my tablet. Other passengers would ask me what we were seeing. Frankly, it was difficult to finally close the drapes and close my eyes at night. Several times my husband took off on the provided tour and I stayed onboard. They offered 3 different activity levels of tours. So the ones I went on were fine. I sometimes passed on part of tour with lots of stairs. For instance, we took a minibus up to a castle, I sat outside overlooking the Moselle River and listened to the guide on my headphones. Our Vantage riverboat did not have a pool. It did have bicycles. I think you both would love it.