Kealakekua Bay encompasses 315 acres and measures 1.5 miles in length and one mile in width.  It is the largest sheltered natural bay on the island of Hawaii.  The spectacular marine sanctuary at Kealakekua Bay offers an abundance of colorful tropical fish, a variety of beautiful coral reefs and visibility often to 100 feet. The calm, protected waters and sunny skies of Kealakekua Bay provide superior snorkeling and diving year round, with the water temperature averaging 76 degrees. 

A pod of Hawaiian Spinner dolphins frequents Kealakekua Bay.  The bay serves are a place for them to rest, feed, and a nursery for mothers and their calves.  Due to the calm water conditions, extensive coral reef, and thriving underwater life, Kealakekua Bay offers some of the best snorkeling and diving in Hawaii.  From the wharf across Kealakekua Bay, you can see the Captain Cook Monument.  In the shallow waters adjacent to the Monument is where the best snorkeling and SCUBA diving is located.  Additionally, there are spectacular views of the bay and the sheer cliffs on the eastern edge.

If you make it out to the bay early enough, you may be lucky and see a pod of Spinner dolphins.  Also, you can be sure to see Hawaiian Sea Turtles in the shallow waters near the Monument.  Expect to take a lot of pictures and prepare yourself by bringing an underwater camera if possible.  The water could not be clearer and the visibility is often reported beyond 100 feet.  View satellite photo of Captain Cook and Kealakekua Bay.  You should consider purchasing an underwater camera to capture the magnificent coral and underwater sea life.