Definitely book through Capt. Marvin's ahead of time! He's got a good fleet of boats, great staff, very accommodating. When you get off the tender in Grand Caymen, his office is just a short walk. But, hurry! He sticks to a tight schedule, and unfortunately, he could no longer wait for a party of 4 on his list. You are shuttled to the marina and board crafts of about 30 ft. First stop was for snorkeling at a reef, followed by an awesome experience with the rays. Feed the rays squid right from your hand!!! Snorkel gear, masks, & fins were provided. Fruit punch and cold water provided on the boat. Our captain even pulled alongside an awaiting watercraft to pick up a birthday cake that the grandparents had ordered for their grandaughter's 6th birthday! We all had cake and sang! She loved the excursion, but was a bit apprehensive to get into the water at first.
The ship sponsored excursions really PACK them on the boats and by the time everyone gets off and into the water, they're blowing the whistle to board again!!!
Go with Capt. Marvin's for sure!!!