Flamenco Beach
Flamenco earns the superlatives. A mile-long horseshoe of white sand enclosing water that grades from clear to turquoise to deep blue, with a reef at the eastern end for snorkelling and surf gentle enough for children through most of the bay. The odd landmark is a rusting US Navy tank left on the sand from when Culebra was a bombing range, now covered in graffiti and universally photographed. Facilities exist - kiosks, restrooms, showers, camping - which is unusual for a beach this good. Getting there means the Culebra ferry from Ceiba or a small plane, and the ferry is the constraint.