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I was not disappointed at all by the snorkeling in Trunk's Bay on St. John. In fact, it is certainly one of my best snorkeling experiences (probably a close second to Stingray City in Grand Cayman). But you've definitely got to hit Paradise Point (go up the mountain next to the shop in the gondola) and have a Bushwacker at the cafe on top. It's the best after a long day at the beach.