If you are authorized to use military facilities I highly recommend the Joint Base San Antonio Recreation Area at Canyon Lake. My wife and I just spent a week there and we loved it! We also drove through the RV campground on Ft. Sam Houston and it looked very nice. We just enjoy being closer to water and nature. If you cannot use military facilities there were several nice-looking RV parks on FM 306 (?) between New Braunfels and Canyon Lake.