This is highly recommended while you are in Barbados! It's a day-long outing on the water with opportunities for snorkeling over coral, and in a spot where you can see sea turtles, fish, and even shipwrecks.
Our catamaran carried quite a few passengers but was large enough for everyone to have a place in the sun (or in the shade, if preferred). The trip included a lunch with fried flying fish, as well as some type of tasty chicken dish and sides. There were complimentary cocktails throughout the day, and they were quite good.
Snorkeling was a lot of fun, but you do have to keep a life jacket on if you intend to use their masks--otherwise, there are no restrictions.