Had a nice ride today -- this place holds some v-strom approved riding. I didn't encounter any sand, and actually the side roads were even nicer (no gravel, just dirt), assuming you wanted a little adventure from washouts, etc :-)
The main roads are kept easily passable by passenger cars, but still offer some excitement and curves. The side roads are like jeep trails, single car wide. I'll have to make a loop or two of the nicer side roads when I go back. Still need to get a handle on where everything leads.