About 400 miles west of the Texas Hill Country, Big Bend National Park, one of the least visited parks, has 800,000 acres of wild country. Typical September high temperatures are 80's and low 90's. October is typically 65 - 85 degrees. Click here for daily temps on Wunderground.com.
"In the heart of Big Bend National Park, you'll find the uniquely located Chisos Mountains Lodge nestled in the basin of the majestic Chisos Mountains. As the only lodging in the park, our accommodations provide modern comforts with our famous Texas hospitality. Our guests are treated to stunning scenery and serenity, as well as a vast undisturbed wilderness, all within a quick walking distance to our services and easy access to many of the park's world famous hiking trails." http://chisosmountainslodge.com/