Rausch Creek and AOAA are the only places I know of. I know some other smaller places but not sure if they are completely legal....and non out towards Lancaster...I will keep my eyes and ears open though! I am around an hour away from Rausch, it's better if you make a weekend out of it and do 2 days and camp over night. The off roading group I am in (Twisted Off Road Society) plans events like that in the spring and summer. You can always pm me if you would ever be interested! Our event calendar for next year should be out before the end of this year!