Trunk Bay Underwater Snorkel Trail.

Tucked away in the crystal-clear waters of St. John’s most famous bay, the Trunk Bay Underwater Snorkel Trail turns a classic Caribbean swim into an interactive, self-guided classroom. Starting right from the white-sand shore, this protected route runs along Trunk Cay and features submerged plaques that identify local marine life, explain coral ecosystems, and offer tips on reef conservation. Because it follows a clearly marked path of buoys and signs in relatively shallow water, it is an exceptionally approachable spot for beginners and families who want structure rather than an open-ended reef swim. The beach itself is fully equipped with lifeguards, rentals, and showers, making this a seamless, educational way to experience the vibrant underwater world of the Virgin Islands National Park.