From the parking waypoint take the track into Denham Scenic Reserve for approx 200m then leave the main track at the Green Sign Trailhead waypoint, turn right and head down to Back Creek.
A short 130m rock-hop will get you to the top of the falls and the cache. Do not attempt this cache during or just after heavy rains as the rocks will be slippery. Take care of geokids as there is a steep drop at the falls and no barrier.
GPSr reception is a bit erratic here so we've provided a good hint and a spoiler picture. Please make sure you re-hide the container carefully - Enjoy.