Arguably Hawaii's most well-known sight, Diamond Head Crater is more than just a famous Waikiki backdrop but also an entire attraction unto itself, featuring one of Oahu's best hikes for a panoramic view. From atop the 760-foot (231-meter) summit, visitors can gaze out from Koko Head Crater to the Honolulu skyline and down on Waikiki Beach, where surfers, paddlers, sailboats, and canoes all splash through the tropical waters.