The best snorkeling is at or near the
reef. Juni has a fantasic trip for
35.00 US not including the tip ( and he deserves them) Trip lasts from about 10 to
4.
If you can't do that you could snorkel at
the split, but I don't think thats what you
have in mind. Another option would be to
rent kayaks and paddle to reef, then snorkel.
If you do, please DO NOT stand or anchor
to coral. No offense intended, but we saw this very thing on our trip and the group had come from a cruise.