Thanks for the comments everyone. They're most appreciated.
The footprints in the sand are probably from a Merriam's kangaroo rat, a nocturnal, granivorous (seed eating) creature prefering a sparse to moderate canopy in fine to coarse sands. In the spring the little rat will eat leafy material, and when times get tough, arthropods.
Notice the footprints are evenly paired indicating a jumping movement similar to a kangaroo. The tail, also used for balance makes the mark seen in the middle of each set of tracks (actually the tiny footprints aren't seen in this size image, just the tail track). I found it interesting that the rat appeared to have investigated the little stick in the foreground as a possible source of food.
They obtain water through metabolic processes meaning they do not require drinking water- moisture is obtained solely from food sources.
They live in holes burrowed in the ground near hummocks (bunches) of creosote. When walking through the dunes it is important to watch (rather than wandering dumb-foundly) where one steps, as the burrows can be extensive, and easily destroyed by the weight of a human's step.