The Reef Bay trail is a real nice hike. It is rocky, you need at minimum sneaks. Hiking shoes would be ideal. We did this on our own as the escorted tour was full. It would have been nice to have someone give us the local history of the ruins along the way, and the sugar mill at the end, but we actually enjoyed being on our own instead of with 20 others.
Also, we took the petroglyphs offshoot trail (1/2 mile total). This was an easy walk,and worth it. Petroglyphs are awesome and there is a waterfall and a pool there. You could pack a lunch and settle onto a large rock to eat. Pleasant.
Also, we had a very eerie experience of actually meeting someone there who was a friend of my husband. Not only from our same state, but same community!!! Talk about weird!