Arches Loop Professional Review and Guide
"This ride is a great way to experience Arches National Park on a mountain bike--a great ride for strong novices and intermediates, with only a bit of easily avoided technical challenge and plenty of mileage.
It is perhaps the perfect first mountain bike ride for a strong road rider wishing to make the transition, but expect a lot of sand. You may have to pay to exit the park at the present Arches National Park entrance. Currently the fee is $10 for a car and $5 for a bicycle. At any point, if you encounter a ranger, you may be asked to provide proof of payment or you'll have to pay on the spot. Trail Surface: Broken pavement, gravel, loose rock, sand, hardpack, and slickrock."