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 the Iolani Palace, the only royal palace on U.S. soil. Visit Pearl Harbor to pay your respects at the USS Arizona Memorial or take a surfing lesson on Waikiki Beach. Green Sea Turtle, Hawai'i Diamond Head, Honolulu, Hawai'i