Those are definitely some of the best places to visit, that's for sure. At Big Bend, did you happen to take the horseback ride to The Window? It's one of the most beautiful sites in Texas. Just in case you didn't, here it is from a few different perspectives:
These last two are about as far as you can go without reaching a huge vertical drop. Any closer and you'll be doing an impersonation of Wiley Coyote!
To get a spacial perspective of that last photo, you can go here & see a person standing in it: http://www.thisonetoo.net/to2/images/Apr-03-2001/DSC00026.JPG. (She may not want her photo on FR.)
Dang, I need to contact TravelTex.com to ask for a paycheck. ;-)