Start your adventure from The Avalon Springs side. Tell the security that you want to hike the nearby trail and they will let you through at no cost. Park in the general parking area and make your way to the hiking trail which borders the resorts camp site and pools. The hiking trail is clearly marked with yellow arrows.
Keep left until you reach the river crossing waypoint. Hop over the rocks to the other side of the river and make your way down to the wooden bridge waypoint. Cross the bridge and you will arrive at a sheet cliff face. See spoiler pic.
Now it's time to climb! Cache is hidden under a small pile of rocks about 5m up.
Good luck!