You picked a great ship with an outstanding crew. Just sailed it a couple months ago. You'll especially enjoy Casey your cruise director.
As for Coco it really just depends what you are interested in. We didn't do an excursion and still had a good time just walking around. It hink next time I would try the parasailing. The people who at the barbque said it was good but it happened to be VERY hot the day we were there and we just didn't have an appetite for it.
It was a little different than I thought. There are alot of places there to go in and have a drink. But alot of those places were kind of dead to be honest. It really wasn't that much of a party atmosphere but I'm sure that changes depending on the time of year and how many 20 somethings are on board. Overall, we liked Coco ok but were ready to go back to the ship after a couple hours.