Kualoa Ranch, Honolulu
You might recognize Kualoa Ranch from the TV series LOST, movies like Godzilla, Tears of the Sun, and 50 First Dates. This was what made my trip to Oahu worth it - everything else I could have missed but this was the best. I took the quad tour around the island, which took several hours. They also show you the different sets for each movie filmed there, and theres a fire-dancer who will perform for you and take you out on a boat ride!
Kualoa Ranch offers a wide variety of outdoor activities, educational programs, and scenic tours. The lovely valley setting has been used in several movies and television shows.