Little sahara is a blast Its my most fav place here in oklahoma to ride. We found out its best to got late fall early spring and go during the week the week you more or less have the whole place to yourself. I would love to go to glamis and see what those are like even taller and bigger dunes, it would be so much fun.
Duneracer, have you rode at the redriver? There is a place called muenster texas its west of 35 he has access to the river and lots and lots of place to ride. I been there years ago when I was little on dirtbikes. I don't remember exactly where its it you should be able to google it.