Tei Shek stream (Tung Chung river West - 東涌河)

 Duration: 

3 km (2h). But you will most likely want to stay much longer to enjoy the natural pools.

Difficulty: 

7/10. Note that for some sections, you have to go in the water as there are no real bypasses. So, this is definitely a wet hike.

Cel phone coverage: Everywhere

Water needs: 1 liter. 50% shaded

Appreciation: 8/10. Nice and very clear stream. Lots of pools to soak in.

Map & Details: https://www.mapmyrun.com/workout/4650815911/

Exercise Area: No

Transportation: Exit 'B', go to the bus terminus, take 34 that brings you right at the trail-head (final stop). You can also take 34 right across from exit 'D' but if it gets busy, I always prefer to be at the terminus so I always have a spot. Return the same way. Check the bus' frequency as it is way-less frequent that typical HK buses. Just so you do not end up waiting an hour.  https://www.hkemobility.gov.hk/

Why it's worth it:

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Exit 'B', then...

... go straight through the building.

Straight

Bus 34's terminus is just in front of you. 

Take the bus and go all the way to the end stop.
It should take about 15 minutes

The bus/minibus end stop is right by the Shek Mun Kap Public Toilet (石門甲公廁).
Head left on the road that has a slight elevation

Just about a minute or two later, you will walk by the Tung Chung Lo Hon Monastery (東涌羅漢寺)

A few more minutes into the hike (about 550m from the bus stop), you will reach this fork. 
Take a right which will lead you right into the stream. Actually, it is the first time I see such a well maintained path just to get to a stream!

You arrive at the stream, head left...

... and a few meters after, you'll reach this water catchment. First time you'[ll have to wet your feet today, but not the last!

First pool. Clear water. Very nice!

About an hour into the hike. The tallest waterfall of that stream

Must be bypassed on the left, there are ropes and rock steps

Once you have reached the top of the first falls, keep left and use the ropes to pass the little bit of rock formations that do not offer enough of a ledge to climb on. Once passed, come down on the rope and cross the stream...

... as the bypass for the second falls is on the right. However, you can spend some time in the nice pool there before you keep on going, as this is the last major falls.

The exit point of the stream is about 25-40 minutes later. It is easy to miss if you do not pay attention as the path, while very close to the stream, is not visible from it. Pay attention to the shallow pool and rock characteristic rock face. The path is to the left, less than 5m away. 
Get out of the stream and head left on the path which will parallel the stream, all the way back to the same bus stop, closing the loop!

The bus stop in the distance. Note that you can always walk back to the MTR, which will take you about 45-50 minutes. Not an especially pleasant walk though...

Pak Mong Stream - 白芒石澗 (Lantau)

Duration: 

8km (4 hours)

7/10. Wet trek. Rocks tend to be slippery. Bushwacking with lots-o-spiders.

Cel phone coverage: Full.

Water needs: 1 liter.

Appreciation: 6/10. Waterfalls are nice but it is such a drag to get out of the stream and bushwack up.

Map & Details: https://www.mapmyhike.com/workout/3665239636/

Exercise Area: No

Transportation: Tung Chung MTR exit 'D'. 

Why it's worth it: 

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Right out of Exit 'D', go straight across onto Fu Tung Street. It will take you about an hour to get to the stream.

Go under the bridge, follow on the side of the road

This is the entry point to the trail. Refer to the building and signposts to get an idea of where the path starts (on the right).
It is a bit faint

Just 10-15m in, you'll get to this railing, head left.

You'll get to a road, just cross and keep going on the path

Keep going on the path.

Go down either paths and head right.

Right

About 1 hour in, 3.5km, you'll reach the stream @ Pak Mong village. Just go right in.

Mostly very small waterfalls and slippery rocks. Be careful where you step

About 500m into the stream, you'll get to the 1st larger fall. The pool is very nice. Bypass is on the right before the pool.

Shortly after is the second large waterfall.
Climb on the left, then mid-falls, switch to the right side and climb the rest of the way.

The 3rd waterfall. The pool is also quite nice. Bypass is before the pool, on the rock-face on the right.
From this point on, you have another 30-40 minutes in the stream before the exit point.
There are no more large waterfalls afterwards

Once you get to this point, you are within 75m of the exit point.

That's the exit point. There is a shallow pool and you should be able to identify with the characteristics rock formation in front of you, and the orange mossy rock on the left. The exit is on the right and there's a small white ribbon showing the way.

This white ribbon. There's also orange-reddish ones all along the way up.

I did not like that climb much; narrow path full of spider-webs, rocky, just unpleasant climb...
It should take you about 35-40 minutes.

You will then reach the top of that hill.  Head  left...

... nice view of the airport

After another 20 or so minutes walk, you'll reach a fork. Take the path that goes down towards Tung Chung.
It will take you another 30-45 minutes to get to the road where you started.

Just keep going down...

Back to the road, head left. You will be back at Tung Chung MTR's Exit 'D" in 10-15 minutes...