The 6 mile "Bison Ridge Trail" portion of this route is the single worst marked and overgrown trail I've ever been on. The route indicated on AllTrails doesn't match the park map and includes the 2 mile "Fairgrounds Trail" -- see Helpful Link section for a pdf of the park.
Needless to say after three unsuccessful attempts to regain the trail after passing up an above the (live) Bison viewing area I gave up and headed back the same way I came and called it a day. In my opinion this trail is not worth attempting until more clearly marked along and especially in between blazed sections.
These trails are used heavily by mountain bikes and horse back riders. This section represents a small portion of approximately 15 miles of multi use trails in the park. The trails are a great place for a cyclocross bike or a single speed.