Swimming, snorkeling, paddleboarding, boating, jet-skiing, hanging out on the beach
The Arenamar Cafe serves food and drinks, including a great piña colada, in the building near the western side of the beach. There are bathrooms there as well.
White Caribbean sand
Lots of people make for more trash, but there are good trashcans located along the beach.
The water at Sun Bay can be gloriously clear, or somewhat milky in the summertime, esp. if it has been stirred up by storms. It's always beautiful though.
This is a southside beach on Route 997, 1/4 mile east of the Green Store in Esperanza.
Sun Bay is a public park administered by the Puerto Rico Dept. of Natural Resources. It is a huge expanse of white sand in a large half moon shape. On the left side, it is a rocky shoreline. In the middle is a very long sandy stretch with a small section of rocks and tidal pools near the center. On the right side, there is a long sand bar out to Cayo de Tierra, a small island which is interesting in its own right.
There are several good spots scattered all along the beach with big coconut palms and other trees to provide shade. Natural shade is the best shade!