Deserted caye?
There are great spots to snorkel, under BYC dock and romons dock as well as the shipping dock. Ive seen 5 foot eels under them docks, along with cudas that come in to feed during low tide. Sea horses, beautiful arrow crabs and tons of other stuff just under the docks alone. You can cayak to the reef and snorkel it if you have a rope or anchor with you.