Came across this official Texas Parks and Wildlife video of the new mountain bike trails in Big Bend Ranch State Park.
I rode a few days in this place when I wrote Mountain Biking Texas, for FalconGuides, way back when. There were no trail markers, mostly rough doubletrack, and so much potential for getting lost that it was more route-finding and adventure-seeking than mountain biking. But it was always a great day out.
Hopefully this will get people coming to visit and ride. It's out in the middle of nowhere, a resource that doesn't get much use--good things if you're looking for adventure in the desert.