Like OL said, an hour is not enough, but 3 hours would have been enough for me. There are no facilities on Shell Island, so bear that in mind. In the same vicinity, the younger children may enjoy the Pirate Cruise. That was about 3 hours. The children all play pirate games with the crew on the lower level, and adults can sit up top, enjoy the music, and sip some frosties. They circle near Shell Island and we saw plenty of dolphins too. It's possible you may be able to coordinate both at the same time and split the younger and older children.