Adelmoll,
These look like great plans to me. The choice between Houston and Big Bend is a huge one in terms of the differences and distances involved. I'll stay out of that one. Too much depends on personal preference.
The festivals in Burnet and San Antonio should be spectacular! One of our favorite spots in Texas is near Burnet: Inks Lake State Park. Here is a link to some views there from a couple of years ago:
http://www.dw4u.net/Inks/InkPage.html
Muenster is one of our favorite and regular stops on our first day of the trip to Colorado. We always try to arrive there at mealtime. We park our Montana on the side street and eat at Rohmer's Cafe. We have never been to the festival but it is clearly a community with almost 100% German heritage.