I chose the 25 mile fat tire course. It was a pretty good course, except for a really washboard road at about the 1/3 mark. 3-4 miles of really hard riding on the bum. In all, not much of a fat tire course, you would be better suited with a CX setup. The closest thing we saw to dirt, was one very hard packed dirt road. Everything else was paved/gravel roads. Beautiful scenery, and a fun ride, but not the billing the promoters set this up for.
Some of those back country roads are so washboard that you can barely ride over them.