The Pinel Island trip is pretty good. They take you on a bus to the other side of St. Maarten. Then they take you on a short boat ride to Pinel Island. They distribute gear to everyone and you snorkel off the beach. If the kids want to get out of the water, you can take them to the rest room (primitive but clean) or buy them a soda, etc. There is a separate beach where they could wade until the rest of the snorkelers return and it is time to go back.