Jellystone Park Hill Country is in Canyon Lake, TX, an easy drive from San Antonio. We visited this park on Easter weekend. They were completely booked for the weekend, so we were lucky to get a spot. The RV sites are pretty nice, but navigating around the trees can be tricky. There is a store on site that has anything you might need plus tons of cute souvenirs.
This Jellystone Park has tons of activities. The super cool water balloon station was our favorite, but they also have an arcade, volley ball court, laser tag, swimming, jumping pillow, crafts, hay rides, gem mining, candy bar bingo, and seasonal events like the biggest Easter Egg Hunt I have ever witnessed. Hunting for eggs in the woods is way fun! Check their events calendar, so you know what to expect.
http://www.jellystonehillcountry.com/events-calendar
http://www.jellystonehillcountry.com/events-calendar