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If you're planning to spend time snooping around Lahaina, that's a good time to combine a snorkel at Black Rock. I'd even suggest spending the morning shopping in Lahaina, have lunch, then spend the afternoon snorkeling Black Rock and enjoying Kaanapali Beach. You could rent a beach cabana type chair for 2 at the Sheraton that would offer bar service, etc. It's a really fabulous way to enjoy a few hours on the beach.