things to do oahu cheap?
['Hike Diamond Head.', 'Watch Fireworks from Waikiki.', "Explore the Island's Beaches by Bus.", 'Enjoy Complimentary Classes and Shows at the Royal Hawaiian Center.', 'Check out the Dole Plantation.', 'Watch a Free Hula Show.', 'Visit Pearl Harbor.', 'Climb the Aloha Tower.']