Saturday, to celebrate the cool morning, I decided to do one  of my favorite hikes in and around Austin - Bull Creek Preserve to St. Edwards  Park and return.
 
 
The Bull Creek Greenbelt entrance to the preserve is located  at the northern parking area on the west side of 360. Please read and follow the  restrictions for trail use posted at the entrance and just inside the pass-thru  in the fence. Note that is it a no smoking area, and that no horses, dogs, even  on leashes, or bicycles are allowed.
 
The are several shorter trails and loops close to the parking  lot, and there is also good hiking in the more accessible greenbelt. The longer  trails to St Edwards Park start inside the pass-thru to the right of the signs  and all the way to the fence.
 
Following this trail up the hill you will come to  three junctions fairly quickly. All three lead off to the right to the shorter  loops. To stay on the longer option take the left forks at all. You will  be heading mostly west and a little bit to the north as you can see on the trail map.  All of the trail junctions inside the preserve are very well marked except for  one, and I will get to that shortly.
 
At the next junction (the fourth) you will have the option of  either left or right. The left options heads west up Jester Hill. The right  option gets to the same place but a different, and I think better, way. The  right option heads west also but this trail is steeper and more challenging,  IMO.
 
Both the right and left options end up on a limited-access  power line road. Whichever option you previously took, turn left on the power  line road and continue up Jester Hill.
 
At the top of Jester Hill up will come a City street and on  both sides of the street there is a pass-thru in the fence. Continue across the  street and up the hill but now start paying attention for the junction to the  right that leads north to St. Edwards park. The marker is nearly hidden buy the  overgrown brush and the marker is a few feet to the right of the trail you will be  on. If you come to a second City street you have passed it so turn around, go  back and look for the trail off to your now left.
 
Once on this northern trail  just follow the trail markers,  which are plentiful and easy to see. You will have to negotiate several more  pass-thrus and cross under a large overhead power lines, but will soon start the  downhill section to St. Edwards. I like to stay to the left following the fence  line, but there are numerous side trails off to the right I have not tried any  of these but they are the trails in the hash-mark section of the linked map.  They all look like they will take you down to the park where you will need to  cross Bull Creek in you want to get all of the way into St. Edwards Park. The  creek and all of its feeders are represented by the blue dotted lines on the  linked map.
This out and back (Point A to B, then back to A) takes me  about 2.5 to 3 hours depending on how much time I spend at St. Edwards, but I  walk at a steady fast pace.
 
I have never taken my GPS on this hike (I should) so I can't give  you the mileage. Another poster describes the hike from the other 
direction and says the round trip is 8.5 miles, but yet another poster says it is 6.58. I split the difference and said 7.5.
It actually could be all 3 depending on which and how many of the side trails you do or don't take. You can also do this one way,  but that necessitates a car parked at each end.
 
There are people on the trails on weekends, but not many. I frequently do it on weekdays and have seen no one. Give it a try  and I hope you enjoy it as much as I do!