Hello!
Kerrville is a "little" west of San Antonio, but you want a very nice park, stay at Buckhorn RV Park in Kerrville. http://www.buckhornlake.com/
Very nice and clean.
I would not recommend staying in the Sun Communities RV Resort as some have said on this site. They have really let the Tree Tops Rv park in Arlington go down hill. Oh, they've got the "front office" area looking really nice, but the rest of it is in bad shape. We've heard the same thing about the Sun Community park in San Antonio.
We've stayed at Oak Wood RV Park in Fredricksburg, it's an older park, but it's clean.
We've also stayed at Fredericksburg RV Park in Fredericksburg. http://fbgrvpark.com/ These sites are really close together, you actually step out of your rig and onto the neighbors' sewer connections. We will not stay there again.