Dole Pineapple Plant and Maze, Diamond Head, Hanauma Bay for snorkeling (is closed on wednesdays i think so check b4 you go), evening dinner cruise and submarine ride are worth the $150, the Aquarium, Pearl Harbor, Wiamea Falls and Beach, Sunset Beach is a great place to take a picinic sit on the beach and watch the sun go down and of course a Luau...
went in 2002 and it was a freakin blast!!!