Devil's Fist.
This rock looks a bit like a fist sticking out from the ground, hence it's name. The fist is a result of erosion of the rocks, where the remaining rock is a bit harder than the surrounding rock was. For more details on the formation of this fist see also earth cache listing Wong Chuk Kok Tsui.
The cache is very close by, just around the corner to protect it from being washed away by typhoons. When replacing please make sure the rocks weigh it down well. If you have a problem finding it, refer to hint and spoiler photo - this one is meant to be easy to find. The real challenge is getting there!
Getting there.
Take a minibus or taxi to Wu Kau Tang and walk from there (4-5 hours one way), or hire a sampan from Wong Shek pier to get you to the Devil's Fist and walk over the rocks from there.