There's a new trail starting at Ngong Ping, Lantau Island. The 5-km Nei Lak Shan Country Trail circles round Nei Lak Shan, which at 751 metres is the sixth highest peak in Hong Kong. You can start on the trail in northeast Ngong Ping - just where a trail starts dropping down towards Tung Chung.
The trail is clearly marked by this signpost, from which you climb a little; then reach a junction, where you can choose to walk a full circuit, or walk to near the Lantau Skyrail station, looping along the southern slope of the mountain or (longer) heading along the north slopes.
I walked the southern slope in spring: pleasant, with grand views over Ngong Ping including the Big Buddha. Just tried the northern loop, which though longer is more interesting, with views over hills, Tung Chung, the airport and channel across to Tsuen Wan. Passes through woods, and close enough to the Lantau Skyrail that can hear babble from cable cars passing above.