Activehiker:
The ships are so much different now than in 1969! You will have a great time on a cruise. A Caribbean cruise that includes Costa Maya or Cozumel for the ruins and kayak adventure, horseback riding in the ocean in Jamacia, etc. We did the horseback ocean ride and it was a blast! I actually found it easier to ride in the ocean! Then if you go on one of the Royal Caribbean mega ships (Explorer, Voyager, Mariner, etc), there's the rock wall climbing. There's just SO much to do, or not to do if you just want to relax! We've also done the Dolphin Encounter on Cozumel (but not through the cruiseline - directly through Dolphin Encounter) and that was something to remember. There were only 6 of us to 2 dolphins. If you booked it through the cruiseline, there were 30 people to 2 dolphins. We had also booked the Stingray City Tour through Captain Matvin (on Grand Cayman) instead of through the ship, and again, the ratio was so much better. There were only 12 of us and 3 crew and when the ship's tour showed up, their boat was so crowded!
Just do alot of research and post alot of questions - we'll be happy to answer all that you have! This board is THE friendliest!