Researching TX stop overs!

I'm working on my plans traveling across TX. We enter and spend a few days in San Antonio as we explore the MIssion trail. Ya, I have to see the Alamo!
From there we head to Big Bend, yet to long a drive with too much in between.. We won't make that drive! We just explore too much...
Amistad Nation Rec Area looks really cool, yet best I can tell is closed.. Any clue here?
Backup would be to use one of these 'roadside' spots (rest areas to me) that allow overnighting. Anyone have any experience with these or up to date info?
I'm working San Antonio to Big Bend and hoping to explore a bit along the way. Any info or direction will e truly appreciated!
Safe Travels all!
From there we head to Big Bend, yet to long a drive with too much in between.. We won't make that drive! We just explore too much...
Amistad Nation Rec Area looks really cool, yet best I can tell is closed.. Any clue here?
Backup would be to use one of these 'roadside' spots (rest areas to me) that allow overnighting. Anyone have any experience with these or up to date info?
I'm working San Antonio to Big Bend and hoping to explore a bit along the way. Any info or direction will e truly appreciated!
Safe Travels all!