Take the MTR (subway) to the Tai Wo station in the New Territories.  Take Exit A and head left, following the sings for the bus stops and head down the escalators. From here, you can either take Bus 64K or minibus 25K to the Ng Tung Chai stop. From the stop, head down Ng Tung Chai road on your left (due south) through the village. There are a variety of paved paths here, but generally follow them upwards until you see a sign marking the way to Ng Tung Chai waterfalls (you will also be able to hear the river so when in doubt go up and head towards that). After walking 15-20mins on the concrete trail you will pass a temple and cross a small stream on a bridge where a sign with a trail map will be. This is the beginning of the trail.

The trail itself is mostly made from rough, rocky steps or compact earth that gradually ascends. It can be very slippery in the rain. There are four waterfalls along the way: Bottom Fall, Middle Fall, Main Fall, and Scatter Fall. As you follow the trail they are all impossible to miss and highly recommend stopping and taking a dip in the swimming holes below each one! Once at Scatter Fall you have two return options: continue and go down the mountain to make a loop or backtrack and go past all the waterfalls once more. Backtracking is probably the more scenic route. All in all, the hike is not strenuous, and only takes around 4 hours with frequent, relaxed stops.