Punalu'u Beach Park, also known as "Black Sand Beach" is located on the windward coast of Oahu. The beach is very picturesque with black sand made of basalt and a background of leaning coconut palms. The black sand was created from lava flowing into the ocean and explodes as it reaches the ocean and cools.
Near shore, the beach as a reef and is rocky which makes for poor swimming conditions. The beach has a large amount of fresh water that flows into it. At the far end of the beach can be seen a pond with exotic ducks as well as a natural fresh water wading pool. The fresh water is very cool and almost look like gasoline mixed with water. Legend has it that the ancient Hawaiians, in times of drought, would dive underwater with a jug to get fresh water. The name of the beach "Punalu'u" means in Hawaiian "spring diver".
Punalu'u Beach Park is popular for snorkeling when the water is calm and for fishing, particularly for the fishing of octopus. In some areas around the beach, tide pools can be seen with fish and other marine life trapped in it. The beach is also a favorite location for green turtles who come to bask in the sun or to enjoy the seaweed.
The park has restrooms and showers, but no lifeguards. At the far end is a nice grassy area with picnic tables. Locals often would have picnics at the location. There are quite a few tourists that come to the beach. You should be reminded that the turtles are protected, and there is a sign saying not to pick up the turtles for pictures.