The world-renowned Westin Mauna Kea Beach Hotel is located on beautiful Kauna'oa Bay, considered by many to be the island's single most picturesque beach. Crescent-shaped with pure white sands and shimmering aqua waters, it is perfect for water activities including swimming, snorkeling, scuba diving, sailing, kayaking, catamaran riding, whale watching and deep-sea fishing. Even at night, guests step onto a circular lava outcropping overlooking the Bay, to watch the manta rays swim beneath.