You can always just snorkel to the right of the tender piers at Devils Grotto and Edans Rock. There are a number of dive shops right there that will rent quipment to you or even SCUBA gear if you are PADA and have your card to show them. At the Tender dock you will also find a number of independant agents that are willing to book you on a snorkeling tour. Just remember that you are on your own so make sure you get back to the ship on time and if something happens or you are not happy, too bad, you do not have the ship to back you up.
Jim
Fasination to Grand Cayman
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