What are some "don't miss" attractions in Hawaii?

Well, all the events at Kaneohe Yacht Club.  But if you have more time, may we suggest, at least on the island of Oahu, a biased list, not necessarily in order:

• Polynesian Cultural Center
• Waikiki Beach and nearby commercial extravaganza
• Bishop Museum (closed Tuesdays)
• Pearl Harbor (if you get there real early)
• Hanauma Bay Nature Preserve
• La Mariana Sailing Club and Tiki Bar (next to Keehi Marina)
• Dole Plantation (if you got the Keiki, children, with you)
• 'Iolani Palace
• Maritime Museum  Shut due to budget constraints