With 5-6' swells from the N to NE, the water on the north side will be too cloudy for decent snorkeling. The only clear water will be on the south side, which offers no snorkeling except in the shallows behind Horseshoe Reef on the east end, which is only reachable by boat (and NOT a dinghy!). Book a trip with Sherwin Walcott to get decent snorkeling. His phone number is (284) 440-3243.