We visited Hill Country with friends from Conroe, Houston. We enjoyed it and visited the following places over a long weekend:
Spoetzl Brewery in Shiner
San Antonio where we went to the Alamo and wandered and did the boat ride along the River Walk where the infamous Dick's Last Resort restaurant is located.
Luckenbach which we almost drove past, I loved that.
Fredericksburg is as lovely town, lots of nice shops, restaurants etc. We didn't do the museum.
Gruene pronounced Green, where the oldest dance hall in Texas is located and we saw Kevin Costener's band play, a great night although very hot.
http://gruenehall.com
New Braunfels where you can float in a tube down the Comal River and the Schlitterbahn Waterpark is located. We were going to stay at the River Ranch RV park but ended up not taking the trailer down there and they were very good about letting us cancel.
We had also been going to stay at Canyon of the Eagles State Park which looks great although very busy..
Have fun.