It doesn't look like there is much going on in Bastrop, but I did the Pedal through the Pines there yesterday. You can find their routemap here:
http://www.pedalthrupines.org/docs/Route2006.pdf
Inside the park the hills are short but pretty steep. where the 50 and 65 mile routes branch out on the map it is pretty flat open farmland. The roads all the way to back to where you pick up 71 were all but abandoned and 71 has a nice wide shoulder, but plenty of traffic.
I'm about to post a ride report if you want to read about it.