Came across this spot by accident when driving to Dripping Springs Visitors Center. There was a sign visible from the road stating dispersed camping (BLM) and the Sierra Vista trailhead.

Quite a few spots with fire rings (maybe 10) not too far from the road. The views are gorgeous, yet it’s close to the city and amenities. Luckily we got here early, since it really filled up around sunset. Vans, tents, and RVs all fit.