I started out my hike at the park and don't know what distance I covered.  As another user mentioned, there is a small trail behind the pool (two trails actually) that can take you to the main trail.   Maybe it's just because it's been rainy this year, but it was STINKY.  I was trying not to gag at certain parts. 

If you start at the park or want to go to the park, you have to go under two MoPac lane bridges side-by side.  Under one was a pretty elaborate homeless encampment, which is fine, but maybe not always safe for people going solo depending on the type of campers.  There's also a cool wooden train bridge. 

I wouldn't recommend going this time of year (winter/spring) if you don't want to get your feet wet because you have to cross some water at low points.  I turned around at the deeper water crossing, so I didn't make it to the end of the trail.

There were some interesting things.  On one side-trail, I found what looked to be a homemade BMX ramp course still in the process of being built out of dirt.  There's also lots of fallen trees and little bits of trash all along the trail.