Despite the incredible density, some 40% of Hong Kong is protected parks. Many of the country parks are easily accessible. There are also some spectacular trail running opportunities — the Hong Kong Trail on HKI is the most accessible. But there are four long-distance trails in the area, on other islands and the New Territories:
Hong Kong Trail: 50 kilometers / 31 miles
Lantau Trail : 70 kilometers / 43.5 miles)
Wilson Trail : 78 kilometers / 48.5 miles)
MacLehose Trail: 100 kilometers.