I have not ridden these trails yet, but I was surprised that they were not listed yet on the ST's database. There are 28 miles of multi-use trails in the park, not including the park's Competitive Loop which is already listed on Singletracks. Many of the trails are pretty remote and look much more interesting to me than the Competitive Loop. So I post these trails hoping to stir some interest in the area.
There looks to be a pretty challenging outer loop, starting near the entrance of the park, going up Goats Camp trail to Ford Canyon Trail and then Mule Deer back to one's car. That would be about 16 miles long most in desert backcountry.
If that didn't work, Mesquite to Ford Canyon to Wildlife trails might make a nice lariat. Or a loop of up Mesquite and down Goat Camp.