It can be very easy to miss the entrance to this trail off the main road. An easy way to remember is to look for pine trees after the big dip to the river crossing on the main road.
Once you are on the trail, there is another unmarked crossing to the right, the best way to know you've missed it is if you get to a rickety bridge over a small creek, it's only about 50 meters back.
You'll now be riding on the water pipeline access trail. The locals keep the trail in very good condition as it's the only access they have to paved roads.
When you see the cemetery, you can go up and check out the view but the trail that goes down the other side isn't very good. The trail to the right is where the waterline continues and it's the one you want to take. Just a few meters ahead take another trail to the right and you'll be on the shortcut route. Take it easy as you go down, it gets quite steep and you'll have to dismount for a creek crossing.
On the next "Y" intersection, take a hard left. At the end of this trail there are two options to get to the same place (I prefer the east-bound trail).