I can understand printerguy402 and spouse's position on this. We've got a few years on them but my wife has the same problem his wife does in that arthritis in the knees makes shore excursions very difficult for her. I'm still able to hack some of the tougher ones but even for me the days of small ships, exotic ports where we tackle a dormant volcano by going to the top are in the past. So, we have began to find advantages here and there on the larger ships, stuff I never believed before we would have liked or done especially for her since she stays on board a lot more than I do. For instance, on the two larger Princess ship the Lotus Spa has something called the "enclave" not cheap but she loves it.
We have been on two Regal's and one Royal, just got off the Regal 8 days ago. I found that activity onboard the Regal was ample but not stuff I cared for. One of my favorite cruise experiences is the enrichment lectures. I was very displeased on the first segment when there were none. What they do mostly is have events which amount to sales pitches of stuff they sell, like art works, watches, jewelry, wine sales, and the list goes on and on. In my opinion they lack quality lectures dealing with the area of the world the ship was in. I was going to complain to Princess about that but then on the second segment they had an excellent enrichment lecture. Unfortunately they confined his presentations to a small venue and didn't publish them much, although the audience when they found out about him, really liked it. In the past Princess has done a pretty good job with finding good lectures, this often makes a lasting impression of the voyage on me. I have a hunch that enrichment lectures on a sea day might detract too much from art auctions, the casino, wine tasting and other money raising events.
What he doesn't point out about the theatre shows is what I detest. We don't attend the theatre productions very much anymore in order to see the comics, jugglers, and dance entertainment groups. Mostly because we do not care for the crowded theatre in the evenings where some of the rows have close to 30 seats in them; many people come very early and grab the isle seats compelling those coming later to squish by the knees of as many as 13 people to get to a open seat, furthermore, these people are reluctant to stand when someone walks by and there is not much more than a few inches between their knees and the seat in front.
I didn't find any difficulty at all in getting my 2.5 to 3.5 miles a day in. The Regal and Royal have excellent fitness centers, I never had to wait for a elliptical and the treadmills were even more available. As far as the up high walking/running track I never found that crowded or not open, even on the day they had the 5K cancer awareness fund raiser walk.
printerguy402 says they are going back to the larger RCCL ships. On this last voyage we were in port a lot with the "Allure of the Seas" 225,000 gross tons. It is my understanding they offered have a lot more variety in the way of entertainment, including being able to get assigned seats for the big shows. I made friends with a nice couple from Ontario. They mentioned they were on the Allure recently. She loved it, her husband hated it. We aren't going to try it out as we are getting too long in the tooth to experiment with other lines. We do love the perks we have earned. Free laundry, free internet and much more are hard to ignore, from reading reviews and discussing other ships and lines with people, it appears to me that alternative advantages of lines over the three we have been using for "ever", HAL (HAL has got a huge balcony cigar smoking debacle going right now so they don't count), Regent and Princess, is like splitting hairs.