The Na Pali Coast (Kauai) -- Towering emerald cliffs plunge into the Pacific along this 17-mile stretch of coastline that is accessible only by boat, helicopter, or the challenging Kalalau Trail. It is one of the most dramatic landscapes in the Pacific and worth the effort however you choose to see it.
Hawaii Volcanoes National Park (Big Island) -- Kilauea is one of the world's most active volcanoes. You can walk across hardened lava fields, peer into steam vents, and -- when conditions allow -- see molten lava flowing into the ocean. The park also has excellent hiking through lush rainforest on the volcano's slopes.
The Road to Hana (Maui) -- A winding 52-mile drive through 59 bridges and more than 600 curves, past waterfalls, bamboo forests, and black sand beaches. It is one of the great American road trips. Take your time -- rushing defeats the purpose.
Snorkeling at Hanauma Bay (Oahu) -- A volcanic crater that became a sheltered bay, now a marine life conservation district. The snorkeling is extraordinary, with hundreds of species of tropical fish in shallow, calm water. It gets crowded, so arrive early.
Pearl Harbor (Honolulu) -- The USS Arizona Memorial sits above the sunken battleship where 1,177 sailors died on December 7, 1941. It is a solemn and powerful place. Free tickets go fast, so reserve online well in advance.
Haleakala Sunrise (Maui) -- Watching the sun rise from the summit of Haleakala at 10,023 feet is an unforgettable experience. You are above the clouds, and the crater below you looks like the surface of Mars. Reservations are required and it will be cold -- bring warm layers.
North Shore Surfing (Oahu) -- In winter, the north shore of Oahu sees some of the biggest waves on the planet. Even if you do not surf, watching the professionals at Pipeline and Sunset Beach is mesmerizing. The small town of Haleiwa is a good base with excellent shrimp trucks and shave ice.