We recently camped at Mother Neff SP and found it to be great. Full hookups and new facilities. A little SW of Waco about 4 hours for you.
FT. Parker SP s very good, lot of history in the area. It is also good for kayaking.
Village Creek SP is also very good for kayaking.
Closer is Stephen F. Austin SP. Closer still is Double Lake or Wolf Creek both are close to Cold Springs . Both are less than an hour trip for you. Double Lake is federal and Wolf Creek is a state agency (not SP). Great for a last minute get away. If you go to Wolf Creek try to go during the week and get one of the lakeside sites, they are typically reserved on the weekends.
Are favorite is Perdenales Falls SP. Lots of good hikes.
2011 30' Classic
2015 Ford F250 4X4 Platinum