A small uninhabited islet a mile east of Culebra, part of the national wildlife refuge. Day trips by water taxi from Dewey or chartered catamaran from Fajardo land at the protected horseshoe bay of Playa Tortuga, with a beach that sees a handful of visitors at most.
The natural pools — shallow tide pools on the windward side, framed by black volcanic rock — are the real draw. A short hike leads up to the ruined Faro de Culebrita lighthouse on the high point of the island. Bring shoes; the path is rocky. There is no shade, no water, no facilities of any kind.