Had the opposite experience.
We were late getting up and off our ship, and I totally forgot all we wanted to do in GC. What we did end up doing was sign up for a "duck" tour, and while waiting for our time to come up, we went to the little "mall" that Margaritaville is in. Did a little shopping, had some lunch. We totally forgot about the pool/slide, and weren't prepared. We were so bummed that we didn't have swimsuits and had already paid for the duck tour, because staying there would have been a ton of fun.
In the future we'll get ready early, go to Tiki Beach (as we had planned on doing), hang out for a few hours, head back, hit Margaritaville for the pool and a drink, and then call it a day.