Boulder by boulder, participants venture upstream into a wild vertical landscape, surrounded by cliffs and waterfalls, until you can scarcely believe you're in Hong Kong.

The trip affords ample time to enjoy the majesty of the gorge and multiple waterfalls.

Difficulty: Generally moderate. However, the route is technical as it involves some stepping from stone to stone and skirting around waterfalls. An element of agility is necessary.

Tour Duration: Approximately 6.5 Hours in total depending on conditions; there is approximately 4 Hours of walking, including going up the valley and down again.

Bring: Packed lunch to eat in the gorge

Meeting Point: The plaza between Tung Chung MTR (exit 'B') and Citygate Shopping Mall

Rory Mackay was born in Hong Kong and grew up between here and Scotland, and has been a Sai Kung native since the age of 3. He holds a degree in architecture. He has spent time working and skiing in New Zealand and has also lived in Australia. He began his adventure career sailing an 80ft yacht from Scotland to the Svalbard archipelago near the North Pole.

Rory has completed a solo bicycle trip across Vietnam and China, cycling from Saigon to Hong Kong. In addition, he has cycled across Africa, completing the solo ride from Cape Town to Cairo within 6 months, and climbed of some high altitude routes in the Himalayas and Andes. He now runs an adventure tour company called Wild Hong Kong.

Cost: Members of the RGS and their guests are most welcome to attend this event, which is HK$280 for RGS Members and HK$380 for guests, including hiking guide. Lunch and transport costs are to be borne by attendees.