6 HAWAI'I PORT HIGHLIGHTS HONOLULU, O'AHU The stunning Pacific Ocean and Ko'olau Range mountains serve as a dramatic setting for Hawai'i's largest city. Climb to the top of Diamond Head, take a romantic sunset stroll on Waikiki Beach, visit Pearl Harbor to pay your respects or take a surfing lesson at Waikiki Beach. Green Sea Turtle, Hawai'i Diamond Head, Honolulu, Hawai'i