@Whiterhino - why would you be allowed to turn around after you've crested the hill? The directional zone signs are at the base of the hill, not the crest, and the DNR map of the dunes clearly show that the base of the dune is in the directional area.
I've probably missed some degree of sarcasm here, haven't I ?
I'd rather have some asshat perform an occasional loop than a bunch of asshats parked on the top of the hill so nobody else can climb it. At least the loopers give you something to cheer for - a roll over!