Are there any areas in big bend that we are allowed to ride that are more technical and hard? ....
2 weeks out is a great time to reiterate that most land is private and pristine and like the residents who arrived for the peace and quiet, we love that aspect of BB too. Stay on established roads. Around houses and people decrease speeds and minimize dust. Don't leave anything behind, even tire tracks are pollution.
Especially true if you decide, and have an owner's permission, to venture into Terlingua Ranch. Although that is my favorite area to ride, you must be an invited guest. With maybe 20 riders going or friends of the trip who are owners ask around you can find one to show you to their house and back.