Three Fathoms Cove (Kei Ling Ha Hoi) owns one of the perserved mangrove in Hong Kong. The cove is narrow and it has a pair of dams stopping the billow from Tolo harbour, which conserved a mangrove habitat.
The cove is peace and as quiet as a mirror. If you come to the shore at low tide during the holiday, you may able to see families splash and pick clams in the shallows of the bay.
The cache is hidden on the dam that is more than 60 meters away from the village path of Kei Ling Ha San Wai. In between is a mangrove but you can simply walk across when tide level is lower than 1.5 meter.
The Tidal informatin can be found at following link:
http://www.weather.gov.hk/tide/etide_main.htm