I will be taking a six and nine year old on a cruise in January. Usually, we stay on the ship in Nassau, but I thought maybe we would do either the dolphin encounter or the trip to Atlantis this time. I know the little one won't make the height requirement for the Atlantis slides, and wasn't sure if that might be better to do when we all are tall enough. But the water might be cold with the dolphins in January. Any advice/thoughts? thanks!