One way to gain a different perspective on Waikiki — and Oahu and the Hawaiian Islands in general — is to set sail on a catamaran or other charter. You can take a sunset cocktail cruise, a lively dinner cruise, or a leisurely midday sail in waters off Waikiki Beach. Aboard one of these cruises, you'll see Honolulu's cityscape, the rise of mountain ranges in the distance, Diamond Head's distinctive profile, and the vast ocean all around. In the winter months (December through February), look for humpback whales!