This is a lovely diversion from the Wilson trail and beautifully demonstrates the contradictions of Hong Kong ... A peaceful babbling stream with a great view of the city's tallest building!
Access is also possible from Mount Butler road, by taking a mini bus from Causeway Bay as far as you can and then following the road (Sir Cecils ride) all the way to the top, past the 'bomb disposal' quarry and then turning right down the steps when you reach the transmitting station.
Follow the stream north from the main path and enjoy hopping across the rocks as it heads downwards. ( its fun and pretty safe for kids but be careful after rain as the rocks can become slippery)
Just when you think its going 'nowhere', the stream starts to drop away and you will see ICC appear down the valley!
Cross over one more time and when you reach the 'plunge pool' use your geocaching senses to find cache and enjoy this very tranquil spot.
GPS coverage is weak here but you will find the location pretty easily.