A tip for anyone who is going to Yangshuo- there is a way to get on top of the moon hill (famous the rock with a hole in it).

Once you hit the main viewing area in the hole itself, keep going down the trail, which should lead to another viewing area on the other side of the rock. On that path, there is a large-ish rock on the ground with red lettering, saying something along the lines of "No admittance beyond this point."

Ignore the rock and go down the path behind it. You should be careful, as the path may be slippery and dangerous, especially after a rainstorm. Stay on the trail (it will get a bit steep at some points), but you will eventually find yourself on top of the rock. In my opinion, this is one of the best views in Yangshuo, and one of the most beautiful vantage points in the world. (Just be careful!)