From Florida to centeral Texas, San Antonio suggestions?

We are heading from Florida and want to stay Feburary/March in central Texas. We were thinking around San Antonio or Austin area. Seems like they have a bunch of parks that would work. Any suggestions on areas, or even state parks we could stay at this time of year (water/elec a must)?

If you are going you may want to look at New Braunfels area. Here is a map with a RV Park that is well known: