Best Place to snorkel, Nassau, Cococay, Keywest

We have never snorkeled before, our daughter really want to go with her boyfriend. Which port would be the best? Is there a place you could rent equipment and snorkel off shore on your own or would it be best to do an excursion. Would you book private or with the cruise line. Thanks for your help:confused:

Nassau has some really good snorkeling through a dive outfit called Stuart Cove's. Don't be intimidated by all the sharks on the webpage, they make 3 stops at different locations, with the last one being a shark snorkel which is optional. The first stop on the snorkeling tour is a beautiful reef with tons of fish called Goulding Cay. The second stop is much deeper, but it does have a plane wreck, which is pretty cool. And of course the last stop, which about half the people on my tour including myself did, was to get in the water (while holding a rope to minimize hand movements) with dozens of reef sharks being fed on the bottom for about 10 minutes. Amazing experience, but again, it's optional.

http://www.stuartcove.com/

I agree with Stuart Cove suggestion. Coco Cay and Key West were not good.