I know you weren't asking me, but I'm throwing my two cents in, too. As a first timer I also have to wait until 75 days before I can try to book anything.
Onboard-I don't think I'm even going to try to book Palo. The gang has that nice brunch set up for us, and I would like to experience the whole dining rotation and pirate night. We aren't spa people, so yeah.
Cataway Cay-I've been looking at the jetski excursion that Regina took (the one about fish poop) and that sounds fun. Jetski alot around here (in the big lakes) and would love to do it in the ocean. Also looked at the parasailing. I hate heights, but think I would be okay with it. And imagine the pictures!!!
Nassau-I don't gamble (very well), so no casino. Waterpark, meh. Maybe get off the boat long enough to say I was there, {Can you get a stamp on your passport?} So that sounds like a relax and enjoy the ship & fellow DISer day.