This popular hike follows the Wiliwilinui ridge to the Ko'olau summit. The trail is wide and follows a 4 wheel drive road much of the way. Ropes provide assistance in some of the steeper parts. Hikers are rewarded with superb views of both sides of the island. Look and listen for the Japanese bush warbler. For a more challenging hike, experienced hikers can go left at the summit and go down the Lanipo Trail. Or, go right at the summit and go down Hawai'loa.