Halona cove, Oahu. Beautiful beach right next to the halona blowhole on the southeastern shore. Be careful though...in this area is one of the most dangerous ocean currents in the world, Ka Iwi, otherwise known as the Moloka'i Express. Source: Kanu Hawaii
Turtle Cove: It's not uncommon to see 100+ turtles, fitting in the current to eat, and stay off the rocks. There is a waterfall that flows into the ocean, and creates a good area for turtles to feed and a safe haven from predators.
Kauai Secret beach Tunnels Beach on the remote north shore of Kauai, hawaii, USA. this is my all time favorite beach in Hawaii - standing on the beach here you sometimes see dolphins in the bay, monk seals on the beach, waterfalls in the ridges, sharks, turtles, and sometimes nothing and noone by michael sweet