Wadw and Troy,
We did the catamaran day sail over to CC with Seaduced in April and just loved it! A couple of snorkel stops on the way over. The island stopover is only ~ 2 hours, but you can go to the Split for a swim, go to the Lazy Lizard, see some shops along Front St and have time for lunch. The guys did a bit of fishing off the back of the boat on the way back. It was a great day.