Austin Flyers Cycling club does a Saturday morning ride from their parking lot. It is about 35 miles, a loop out to 360, up to Bee Cave, then Cuernavaca to River Hills, back to 360 (on Bee Caves), and back to the shop.
Nice ride, pretty hilly. It is not a no drop ride, but they do regroup a couple of times (I was dropped far enough back that I never caught them, but there are enough cyclists on 360 and Bee Cave that if you were to run into trouble, someone would stop to assist...if needed).