I did do a more involved write up of the trip, and stashed it at
http://banditmotorcycles.com/bigbend/ The area kind of lends itself to dual-sport riding, but it would be a good winter destination on a street bike, also.
There are some twisty roads, and not a lot of traffic. It is pretty remote.
I wouldn't take a street bike there expecting endless twisties, but there are nice roads, and plenty of nice scenery, and some 'nature' stuff to do.