The Blue Trail (is best known for bordering a HUGE CANYON)
                   It's 1.32 miles from Oak Meadow Drive to Lower End of Crescent Moon taking the Blue Trail.  Remember to step out of the way of mountain bikers as they made all these colored trails and maintain them.  Just follow the blue paint on rocks or trees.
   The brake down of the 1.32 miles:  From Oak Meadow Drive it is 0.26 miles to where the trail winds east (right) away from the back of Sage Thrasher homes, in another 0.32 miles you get your first glimpse of the deep canyon from the trail, another 0.07 miles puts you under the highlines which is the best place to walk over to the edge of the deep canyon, wind east toward the canyon when under the highlines 0.10 miles to the large ranch 8 foot high fence, another 0.19 miles gets you to the edge of our water treatment plants drainage fields with a rock cairn with blue paint on the rocks, another 0.16 miles across the drainage field to the gravel road that takes you to Crescent Moon Court in 0.22 miles on that loose gravel that turns into a better blacktop surface road.   Note:  Where the blacktop road meets the loose gravel part of the road, there is a four-car parking lot, which would be a convenient place to park if you are driving to the Blue Trail or the east end of the lower green trail that meets the Blue Trail at the end of this loose gravel road.

My description of the Blue Trail is one of adventure and amazement.  The Blue Trail is in the far NE corner of HW and the SE part follows a deep canyon that separates the end of Canyonwood from HW land.   The best view of the deep Canyon is when you get under the highlines, just follow the highlines east 20 yards to the edge of the canyon and across the canyon you can see the backyard of the home at the dead-end of Canyonwood.   Canywood residents have claimed that, like the bats that historically come out from under the Congress Bridge in downtown Austin, bats swarms are seen coming out and returning to caves in this deep canyon daily (I haven't seen them yet).   Remember bats are important to our ecosystem.   As an experienced mountain climber, I have made it to the bottom of this canyon and there are NO trails or easy way to get down there or any easy way to travel at the base of it.
Also, you'll find the Blue Trail butt up against a 10-foot tall fence because HW also borders a huge TX ranch at this spot.   
If you have dogs, be warned, that the north end of the Blue Trail that both meets up with the Lower Green Trail and a construction road off the lower end of Crescent Moon, has our HW MUD wastewater vast drainage fields that have signs saying, "Do NOT drink the Water" as this is HW wastewater drainage that allows natural good bacteria to feed off HW wastewater.