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No, they don't have any - those used on activities are supplied by the activity supplier. OV or independent trips on boats often have them even if not mentioned, tho' if snorkelling isn't mentioned in OVs splurge, they're probably not good snorkelling locations. You could buy at pretty well any destination, I think mebbe around $20, dont know if the shops on OV/OV2 sell them but if they do they'll be over-priced. OV's catamaran snorkelling with turtles, Barbados, was brilliant and, unusual for ship's excursions, good value. Have a great cruise. Chris.