The entire cruise was so tuned to people who could not walk more than 30 minutes on flat ground that it markedly reduced the value of the trip. In addition, the food was so outrageously fatting that it was impossible to find even a marginally rational diet. I ended up eating almost none of the evening meals (and missed most of the social benefit from them) because, even being very careful, the food provided for the breakfast and lunch meals contained far more calories than even I needed - let alone the very, very sedate passengers. They tried to provide a bus for "slow walkers", but what they needed was a bus for fast walkers. No one wanted to miss anything, so all the buses were slow walkers. In addition, many of the local tour guides were poor at best. Near the end of the second tour, I ended up with a walking tour led by an elderly woman from Canada living in Germany. She was so good it made clear how uninformed many of the other guides were and unimaginative their tours were.
