Recommended Texas Campgrounds or State Parks?

Lake Livingston

Didn't stay here, but visited the park and thought it was nice.

Man, so many places around Austin and San Antonio.

Look at Black Canyon Wimberley (pull through RV spots). Wimberley is smack dab in the middle of the Texas hill country. Your within short driving distance to Pedernales and Blanco. San Marcos is right up the road as well as canyon lake. Several rivers nearby that are all crystal clear. Wineries galore in Fredericksburg, tons of breweries everywhere and so much delicious barbeque. Check out Old Tunnel State park to watch 6 million bats leave for the evening to feed, then head north to Bakersmith, Texas for dinner and drinks (and possibly live music) afterwards.

Of course, you also have to head to Luckenbach for a couple of hours.

If you've never hiked in the Texas state park system, you'll need to register and get your passes. They only give out so many per day. Register at least two weeks in advance (earlier if you can, that way you can get the times you want).

I've got an obvious bias to the area, because I grew up in (graduated from) Wimberley, but I've never brought anyone to the area who didn't instantly fall in love with the place.

Comanche Bluff Campground
McKinney Falls State Park
Pedernales Falls