I did the entire trail--both ways--and saw people below me in the creek when I was nearing the end of the "upper" trail. When I turned around to go onto the "lower" trail, I wound up following a friendly couple with two dogs.
It was getting into sunset, so the trail was dark in spots, but filled with fireflies! It was like a dream!
As it says in the main description, the "turnaround" is actually the end of the trail as it comes out onto Scotland Well Dr. Definitely no parking there, but I sometimes see cars parked down on Spicewood Springs. I may try that next time.
It was dark when I was done, so I had to walk up the hill and back to my car at Middlebie. OUCH! It is about .5 miles from the trail's end, up the Scotland Well hill--which is a 45-degree incline--and then how many streets to Middlebie? A great workout in the end!