This beach also known as Kahili Beach or Rock Quarry Beach, is easily identifiable because of the nearby Kilauea River and rock quarry. It's no longer a working quarry, but is still fun to explore. The beach has a large calm area which is great for swimming, but can be a bit murky. Opposite the pool is a good snorkeling spot. This beach can be a popular surfing and body boarding spot when the surf is up.
If the water is murky, though, you want to avoid it as sharks and rip tides have been know to occur at this time.
This beach is the ocean side of the Kilauea Bay
. The Bay is calm and a nice fresh water spot to rinse off after riding some waves. Kids also like to play in the water. You may see people fishing right at the mouth of the river and occasionally you will see people day camping (however camping is not permitted per posted signs). The stream hits a sand bar as it reaches the sea and forms a large pool good for swimming and fishing, when the water is calm and clear.
At the parking lot you can also launch for a Kayak trip up the Kilauea Stream. It's calm and a nice easy short paddle.
Hidden Kahili Beach
For more privacy you can hike to the right of this beach over a small rock outcropping to a small secluded sandy beach. It's a short walk for some nice privacy, however the water in this area can be less safe when surf is up.