Oahu may be number three in size among its fellow islands in the Hawaiian chain, but it is first in population. Nearly 900,000 people share Oahu’s 600 square miles of mountains and beaches. Oahu is also the most visited of all the Hawaiian islands, at approximately 4.5 million visitors annually. Honolulu, Pearl Harbor, Diamond Head and Waikiki are all located on Oahu. The island of Oahu is formed...