This, unbeknownst to me, is a very popular spot in Austin. The trail is a 15 mile out and back depending on where you start. It could also be a 15 mile loop. I did an out and back section between the Mopac Hwy Trailhead and the Hill of Life Trailhead. The hike was a total of 6.6 miles of overlooks, hills, waterfalls, rock climbing and people lots of people. I got there in the middle of the day and middle of the week hoping people would still be at work. Apparently, people do not work in Austin. I had never seen so many cars at a trailhead before. I walked about a third of a mile before even getting to the trail. The trail itself was very nice. Well groomed with little to no trash. The biggest issue was trying to get pictures without random people in the background. There were two main waterfalls in the section I hiked but they were filled with people so I did not get pictures. I chose the section because of the waterfalls and they were very nice but way too many people. The other section leading to Zilker Park had more of the rock climbing cliffs. I did see some people rock climbing on this section. The highlight of the hike was the climb up the Hill of Life. It was a leg busting experience. It was a long steadily climbing hill that was not too steep but long. 
I really like this trail. I will try to get back here and do the Zilker Park section and this section again when there are less people. This was hike 31 in my 52 Hike Challenge Explorer Series.
Next a park with not many people but a lot of dogs.
Big Guy Hiking 