The island's crown jewel, Trunk Bay, is the beach typically seen in brochures and on postcards, but it can get overly crowded at times. Unlike the island's other beaches, a small admission fee is charged to visitors of Trunk Bay. The beach is staffed by life guards and also offers showers, picnic tables, a snack bar, and snorkel rentals.

Most uniquely, Trunk Bay has one of the world's few underwater snorkeling trails. Plaques under the sea point out interesting sites along the coral reef. While snorkeling or diving, don't be surprised to find yourself surrounded by schools of hundreds of tiny shimmering silver fish, called fry.