Take Highway 270 north from Kawaihae. Just before Mile Marker #5 turn right on the dirt road leading to the ocean. Jeep travelers can drive the dirt road to the beach. Otherwise, the walk is about 100 yards.
Crystal cove is small cove. Wonderful coral and fish variety, water is crystal clear, great scuba diving. Usually calm during summer months. No facilities. No lifeguards.

Kahalu'u Beach Park

Take Ali'i Drive south from Kailua-Kona. This beach is located at Mile Marker #5, south of St. Peter's Catholic Church.
Kahalu'u Beach Park is dark-grey sand beach, next to St. Peter's Catholic Church and Ku'emanu Heiau. Great snorkeling, surfing, boogie boarding place. A reef lies just offshore, good swimming inside the reef. Outside this area tuna, marlin, and dolphin can often be seen jumping. Facilities: Picnic tables. Rental concession. Lifeguards. Restrooms. Showers.

Take Highway 130 south from Pahoa. When it dead ends at Highway 137, turn right. Just before Mile Marker #9, turn left on Kapoho Kai Road. Take the next left on Kaheka and then right on Waiopae. The pools stretch for 1 mile along the coast.
This large collection of tidepools and spring fed pools with volcanically heated. It stretches almost a mile down the coast and extend up to 200 yards out into the ocean. A wide variety of fish, good snorkeling, swimming, and sunbathing. No Facilities. Keep off of private property.