We did a dolphin swim in Costa Maya (I think) a couple years ago when we were on the Conquest out of Miami...it was an awesome experience so you should definitely do that...maybe we'll do it again! I think our girls are too small for the ATV ride but from what I hear about Manzanillo, you probably want to have something set up as the dock is a bit far from the town. I might dive there or maybe do just the resort with the family, if we don't go horseback riding or snorkling. I'm sure there is a ton to do in Acapulco and it seems as though you can't book anything online yet for that port.
I'll try to remember to wave at you when we come in! I'm an early riser so I'll probably be up on deck when we arrive. You can't beat the location of that hotel! My wife and I had a drink and ate too in the pub downstairs once which is pretty good, if you dont feel like goign out when you get there. What time do you plan on going over to start the embarkation craziness?