Koko Crater is a unique hike in Hawaii on Oahu. Yes, everyone says the other islands are better than Oahu.......but thanks to some friends who used to live on Oahu (Rebekah & Trina), I found some interesting things to do there. Get out of Waikiki, and you will see some cool non-touristy parts of the island.
Koko Crater does have tourists......but it is a unique hike. Have you ever climbed up a rail road track before? 1,000 steps to the top. It was a little scary going down, as you don't want your foot to go in the hole between the stairs. A unique hike if you are up for an adventure on Oahu.