White Sands National Park is quite a unique location in the United States. If you can go, I definitely recommend it, but a fly-over in a sim works if you can't!
The special white sands are created from gypsum, deposited from water runoff from the nearby mountain range.
This flight takes you over the San Andres mountains, with the desert and White Sands National Park popping up right on the other side of it. If you detour a little further east you can find the entrance to the park.
Head north across the white sands and you'll find the exposed basalt of the Valley of Fires. A volcanic eruption 5000 years ago covered the area with molten rock up to 160 ft. thick, which is now visible as the exposed basalt rock. Check out the satellite view of the map for this flight plan to get a clear view of where the Valley of Fires is.
Your destination is Carrizozo airport, for which you'll be lined up perfectly to land on runway 6.