Hi musicgirl,
There were a lot of people on this excursion...I believe I read it can hold around 150. We went last June and the boat was probably 80-90% full. I booked the excursion the first week we were able to (I think it was 60 days out), however, I think I probably could have waited until we were on board before I actually booked it and we still would have been ok.
The boat ride isn't nearly as much fun as the catamaran, but the snorkeling at Trunk Bay more than made up for it!!
Oh yeah.... the crew from the Leylon Sneed try to take pictures of everyone at the beach, snorkeling, etc.... and you can either buy some pictures or a disk to take with you as a souvenir.
Any more questions, feel free to ask.
Sherry