The Hamakua ditch trail is also called the White Road trail. It begins at the end of White Road on the Big Island of Hawaii. After you walk around a water tank, you will enter into a lush jungle. This is a beautiful hike. It is quite easy. After about 20 minutes, you come to the edge of an enormous valley. You are on top looking down into Waipio Valley. I have seen photos when the waterfalls are pouring off the cliffs. On my visit, the skies were fairly clear and we did not see any waterfalls. Nevertheless it is a beautiful view and certainly worth your time.