Robert Meyers
Google
The petroglyphs are amazing by themselves, but the location at the base of a waterfall can make them even more special. The Reef Bay Trail can be a little arduous, but it's definitely worth the effort.
One thing worth noting is that the weather can drastically change the views. Usually the waterfall is pretty minimal or even completely dry. If you have the opportunity to visit after significant rainfall, I highly suggest it as the waterfall becomes an impressive sight in and of itself. However, if the flow is significant enough, it can cause the pool of water to rise enough to obscure the bottommost carvings. In addition, the trail down to the Reef Bay Factory site might become extremely swampy. Even so, it's worth it to see the flowing falls.
As you approach the petroglyphs site, there is a footpath leading up the hill to the left that goes up to the upper falls. While not quite as impressive as the lower falls, if the rainfall has been sufficient it's still a lot of water. The view down the stream to the lower falls is also an interesting perspective. The access is very steep and can be muddy, but worth it for the more adventurous.