Mosquito Bay is the brightest biobay in the world.  There is no way to describe it but that you must see it.  The trips to and from Vieques island are hit or miss on the ferry, though, so if you can...

If paradise had palm trees...they'd call it Sun Bay.

This appropriately-named beach, curving like a half moon, is shallow enough to walk out 40 feet.

Located at the far western end of Puerto Rico, this narrow beach gets high ratings for diving the offshore reef in 10 to 30 feet of water, which features sloping valleys and huge coral.

The rough surf of Navio Beach attracts surfers and a younger, more hip crowd.

Snorkel among colorful fish in the coral gardens of this Vieques island.

This rather remote beach is scenic and breathtaking with a mildly rugged coastline and perfect waters for swimming and snorkeling.

This shallow reef is teeming with coral and sea creatures, making this underwater site alive with movement and color that surrounds the diver.

An open-water dive with depths from 50 to 75 feet, this popular site was an area used by the Navy for anchoring, and where underwater explorers can find bottles and other interesting "artifacts."

A popular diving spot for underwater explorers with scuba or snorkeling gear.