We did the half day trip and loved it, it was the highlight of our cruise. I do want to mention, tho, that our tablemates did the full day and had a wonderful time, they left a little earlier (tho we got to Capt. Marvins at just about the same time) and got back about an hour later. They'd had a lovely BBQ on the beach and some time there in addition to the three stops, oh, and a stop to dive for conch. I am seriously considering this one for our next cruise.
Karyn