What are must-do's in Kauai?

Kauai's three essential experiences are a Na Pali Coast boat tour, a helicopter flight, and Waimea Canyon. The Na Pali Coast — 17 miles of sea cliffs up to 4,000 feet tall — is accessible only by boat, helicopter, or a strenuous 11-mile hike. Captain Andy's ($229–295) and Blue Dolphin ($189–259) run sunset and snorkel catamaran tours along Na Pali from Port Allen. Jack Harter Helicopters ($169–399) is Kauai's most respected aerial operator; their doors-off tours deliver unmatched photography conditions. Waimea Canyon, the 10-mile-long geological formation called the Grand Canyon of the Pacific, is a free drive-up experience from the south. Snorkeling at Tunnels Beach on the North Shore and the Fern Grotto river cruise round out a full week.