Info from Hong Kong's Great Outdoors
Hilltop named after crags that, from below, give it a profile like a resting lion. Rather tough hike/scramble to the top, but the reward is exhilarating views, across hills to the north, and Kowloon below. Some people perhaps don’t notice the path, and instead use ropes to climb up a cliff that overlooks the city:- quite baffling.
Hike (or rock climb), with access perhaps from near Kowloon Reservoir (bus 72 from Cheung Sha Wan), or from Sha Tin Pass (taxi from Choi Hung MTR Station).
Lion Rock articles/photo albums elsewhere on the Internet
Lion Rock is a climbing guide.