Morning, if you would like to be right next to the river " River Road Camp" is a good location. Priced fairly, has it's own little store. But there are so many other rv places.. If you look in past threads like Spinnernuts Great Guadalupe adventure...this was a nice park but it was during a bad drought and the access to river was very steep. Things may have changed.
Txbum Leisure Resort near Seguin is a nice place , next to river, also has a nice pool , play ground for kids....Palmetto State Park is nice but can be quite hot this time of year, lot's of flora and fauna, river passes thru a few miles off Interstate 10 at Luling state Hwy 183 ..Good luck Txbum Rick