Here is a picture I took a few springs ago in the park. The melting early morning snow gave the dunes the dark bands of color.
Here is a view of the dunes from across the southern prairie.
This was taken standing in the creek. If you go there, go in spring when the creek is still flowing.
The front side of the dunes are nice and smooth and fun to climb. But the back side of the Dunes, where the sand falls back into the creek is pretty cool too. Here are some close-ups I took that make the backside of the Dunes look like massive canyon walls with sand waterfalls.
Early morning is also good for the dogs when the sand is not too hot. But this was in May.
Photo-fish, those are wonderful pictures! Your photos are wonderful. Your examples have stirred my desire to return to Sand Dunes. I believe that you are correct about my inquiry of the location of the picture in the OP.
Next time I WILL bring some better equipment. Cameras do not like sand dune environments.
The Dunes are awesome to explore & the surge flow of Medano Creek is fasinating to watch. Comes through about every 20 seconds.
[youtube:18beemhf][/youtube:18beemhf]
This is one of the few places in the world where one can experience surge flow, a stream flowing in rhythmic waves on sand. Three elements are needed to produce the phenomenon: a relatively steep gradient to give the stream a high velocity; a smooth, mobile creekbed with little resistance; and sufficient water to create surges. In spring and early summer, these elements combine to make waves at Great Sand Dunes. As water flows across sand, sand dams or antidunes form on the creekbed, gathering water. When the water pressure is too great, the dams break, sending down a wave about every 20 seconds. In wet years, waves can surge up to a foot high!
http://www.nps.gov/grsa/naturescience/hydrology.htm