Summer time hiking at the Austin greenbelt. Brian and I parked off 360 and walked in near the Gaines/Twin Falls entrance. The Austinot has a great article on this entrance and other greenbelt entrances:
3918 S. Mopac Expy
This entrance, in my opinion, is the trickiest. From Capital of Texas Highway, turn as if you’re heading south on Mopac. But instead of taking the on-ramp, remain on the frontage road. Just past the ramp, you’ll find the next Barton Creek Greenbelt access point. Look for parked cars on the right side of the road, and you’ll find the entrance near the U-turn.
There is no parking lot, which is why it’s so tricky. So be extra careful of traffic when walking along the road as you arrive.
Wherever you enter, you can expect wonderful creeks, great trails, and plenty of people with their dogs.