Actually we're thinking about the Dunn's River Falls tour in Jamaica, however on another thread, it was suggested to me to google Trevor Hadlin. You can look at my other thread about excursions. There were good suggestions.
At Grand Cayman, we plan to do the Stringray/Snorkel trip through Capt. Bryan's.
Cozumel....well, we haven't decided for sure...but we want to snorkel there as well.
Don't wait too long to book your excursions, the really good ones might sell out. In fact, you have to book yours now...or you have to wait and book them on the ship. You may be fine doing it that way, but, you might also miss out. From what I have read, there will be 3 or 4 ships at these ports at the same time, and they are probably pretty much sold out. I know ours is sold out for the Aug. 5th cruise.
Whatever you decide, you and your family will have a GREAT time....how can you not?? Cruisin' is FUN!!!