This review is more for the MTB at Boyce Park which is awesome! I like the park in general and strongly recommend it for a good city getaway day without having to go to far (it's right by Monroeville).
Anyway I love MYB at BP. I would call classify it as being mainly fast single track with some moderately technical elements. I usually start at the soccer field and ride up the road (paved) until I get to the "Outer Loop" sign. I take this to the left all the way to the log cabin, cut across the road and back to the soccer field. Whole loop take me about an hour. There are little offshoots in the trails which can extend your biking experience depending on how you choose to go. FYI- It's easy to get lost or turned around in the trails so best to go with a knowledgeable person your first time.