Actually, Glamis north is the name of a KOA park up at the spas by Bombay Beach. It's 15 miles north of Niland off of Highway 111. It has nothing to do with Glamis, and there are no Sand dunes there. There is good desert riding. And you can access the Bradshaw Trail from there.All the way up at the very north end of Algadones dunes, near Niland. Back in the day we used to camp up at Mamoth wash. Haven't been up there since the early 80's.