southern caribbean snorkel

[taterules]

I'm looking for a shore excursion (hopefully through Princess) where you snorkel, but you go on a boat where you have a little room to lay out on deck, can hang your feet over the edge, etc. Most of the time, we get crowded boats where you're stuck on hard benches the entire trip. I tried posting this on the Princess board with no luck, so I thought I'd try here. I would be willing to consider going it on my own for a great experience. We're going to St. Thomas, St. Kitts, Grenada, Isla Margarita, and Aruba.