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.

Great Guide to Trail Running in Hong Kong