Clearly visible around 19km off the coast of Rincón, Isla Desecheo is a barren 370-acre hunk of rock that became a national wildlife refuge in 1983, off-limits to casual visitors. The real draw lies beneath the sapphire waters that surround the island, an underwater wonderland with consistent 30–45m visibility, open for diving and snorkelling. Amid the shimmering corals, swim-through tunnels and caverns just offshore you’ll spot nurse sharks, giant lobsters and a plethora of tropical marine life: porcupine fish, spiky scorpion fish, and schools of flounder, snappers and triggerfish. Boats take around 45 minutes to reach the island for details.

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