It's getting harder and harder to just wing it and head out to a TX
state park.  Gotta get those reservations, brother.

You looking to fish? swim? kayak? hike? bike? rock-hound?  It depends
on what you are looking for, as to where to head.  I'm on a lifetime
quest to camp in every state park in TX that has camping (only about
1/3 of the way there).  My general advice is to head west.  The Hill
Country parks are very nice...  favorites are Garner, S. Llano,
Pedernales.  Try Bastrop and Buescher for nice little lakes.  Lake
Somerville has nice fishing.  Palmetto is a neat little ecosystem on
the Guadalupe river.  If you go REAL far west, my favorites are
Balmorhea for the swimming and Davis Mtns for the camping and hiking.
Of course Big Bend and Guadalupe Mtns are worth the long drive as well.

Don't forget the county and river authority parks.  LCRA has some nice
ones around the Highland Lakes.  In your zone, going coastal is always
fun with the pop-up on the beach.  The Louisana parks are ("were"?)
pretty nice, too.

Main thing;  get out there and get it popped-up! (Hmmm.  time for me to
take my own advice)

Buzzardcheater
Austin, TX
01 Cottonwood
97 Z71/05 4Runner
Kids, dogs, the usual.....