Fajardo's eastern coastline holds 23 offshore cays within a three-nautical-mile radius, each ringed by elkhorn and brain coral colonies that survived the 2017 hurricane season and now host parrotfish, sergeant majors, and juvenile barracuda in water averaging 26 degrees Celsius year-round. The Villa Marina basin, dredged in 1984 to accommodate charter sailboats, became the official departure point for afternoon snorkeling boat tours in 1992 when the Commonwealth designated the corridor between Fajardo and Culebra a marine conservation zone requiring a three-dollar-per-person fee payable at embarkation. Tour operators run twin schedules: morning departures target Palomino and Palominito for calmer conditions, while afternoon sailings between 13:00 and 14:00 head east to Icacos or north to Culebra, where prevailing trade winds fill spinnakers and cut transit time to under 40 minutes. Icacos, a 15-hectare uninhabited atoll 11 kilometers offshore, sits atop a submerged limestone shelf that drops from two meters to 18 meters within 50 meters of the beach, creating a natural snorkeling corridor where sea turtles forage on seagrass beds visible from the surface. Culebra's Flamenco Beach and Tamarindo reefs lie 27 kilometers north, accessible only by catamaran or powerboat; the latter covers the distance in 35 minutes, while twin-hulled vessels take 50 but offer shaded seating and onboard restrooms. Both routes pass the Cabezas de San Juan lighthouse and the bioluminescent lagoon at Las Croabas, though afternoon light eliminates the phosphorescence that draws kayakers after dark. Captains hold USCG certifications and file float plans with the Fajardo harbor master before each departure. Snorkel gear—mask, fins, and flotation vests—ships with every ticket; underwater cameras and prescription masks cost extra but remain available at Villa Marina's dive shop until 13:15. The marine conservation fee, collected in cash at check-in, funds reef restoration projects managed by the Caribbean Coral Reef Institute, which installed 140 staghorn coral fragments along the Icacos southern shelf between 2023 and 2025. Tour durations vary: Icacos excursions allocate 90 minutes in-water before the return crossing, while Culebra itineraries include a beach stop and extend to five hours dock-to-dock.