Mo-flow and knuckle buster are both DH trails.
Mo-flow has more curves and jumps, but they are smaller. Knuckle buster is a series of 20 ft tabletops.
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Ride from the parking lot down a fire-road. Turn right at rusty bucket and continue down that fire-road. You will come to a paved road that is loping uphill. Go up it. Near the top you will see a trail going off to the left. Go into it. You are now at an area with some benches and two arches. The left is mo-flow, the right is knuckle buster. Ride down and you will be back at the paved road. Go back up and ride again! :)