Say aloha to tropical breezes, oceanfront luaus, and volcanic ridgelines on Oahu, the most populated Hawaiian island. Follow in the footsteps of surfing forefather Duke Kahanamoku on Waikiki Beach, visit the royal quarters of Iolani Palace, and tour Pearl Harbor. Sample hot malasadas (local doughnuts) and shaved ice while shopping for vintage floral-print shirts on Honolulu's Kapahulu Avenue. Then get off the tourist trail with a hike to Makapuu Lighthouse on the South Shore—a place so beautiful, it's been known to host more than a few proposals.