Don't "over-complicate" these directions....if you can find the intersection of 360 and MOPAC (south intersection...near Barton Creek Mall), you are practically there.....Look for the trailhead on the right as you go down the southbound (MOPAC) access road from 360 / MOPAC intersection ...before you make the u-turn!" More details - you want to cross 360 staying on the south bound access road. You can also turn south from 360 onto the MOPAC access road. The access road will split - stay on the right fork (the left goes back onto MOPAC). Park on the right, just before the access road starts to U turn under MOPAC - that is where the trail head is and there may already be cars there.
This hike should take about 1 hour, but no promises!...after the hike, if everyone's up for it, we'll meet at Taco Deli for breakfast.