Thanks for the comments Becky and Rob... The Great Sand Hills Park is huge, but the area that actually has the dunes is only 10 acres or so. Still, a considerable amount of sand! You can walk right onto the sand dunes and compose shots... the wind will erase your footprints soon after you've made them. I was amazed that there was only 4 other cars when we pulled up, being a long weekend and all. Best times to go... right after sunrise or right before sunset. Thanks again for the comments!