The area they are referring to is known as the 500. It is approx. 25 miles of trails, 8 miles or so basically circle the place and are wide enough for those......four wheeled things and marked with blue arrows ( trails are most definitely one-way). The rest are red arrowed, and single track, enduro tight. Since the trails are one-way, you can go as hard or easy as you wish. Membership ( required) is 29 bucks a year, for anytime access. If your son is under 16 he's free. Helmets are required, mature behavior is encouraged.
Some of the trail has rain ruts, with a few downhills a beginner might not like.
Come to the workday, it's a great chance to look the place over . There is lots of work to do, a place like this takes effort, but it's worth it.