The way points of this bicycle route:
Go south on 12 to 3227 and take a left.
Turn left on 3237 - this road is good and there are some nice hills, but the drivers can be real asses - so much for the Tejas spirit.
Turn left on 150 - this road has a little less traffic going this direction during the afternoon, but I encountered some real a**holes along the way - be super careful: a little assertiveness helps but don't be careless.
Turn left on 12 and go to Wimberley. Across the road is acmetary and there is a little shade where you can enjoy your gel.