Koko Crater Arch Trail is a 0.4 mile moderately trafficked out and back trail located near Honolulu, HI that features beautiful wild flowers and is rated as difficult. The trail offers a number of activity options and is accessible year-round.
This hike is cool and offers cool views, but it's a one and done deal for me and I wouldn't do it again. I felt pretty unsafe because there are some super steep parts and loose gravel which makes it very easy to slip and fall. It's actually an easy hike until you get to the arch and then it's difficult. Make sure you wear shoes/hiking boots with a good grip. Park at Sandy Beach, then walk towards the Blow Hole and look for mile marker 15. You'll see a wall of rocks right after where the metal fence ends - that is where you climb up to start the hike. Once you climb up that, you'll be on the ridge and then you continue on towards the arch. You can either go under the arch or above it. If you go above it you can continue on along the path (we didn't do this part - too scary!) but other people were.