Going downhill, turn left at the intersection of trails. This trail is one of the fastest on the hill. From the start it flows so smoothly around the corners that the danger isn't the obstacles, but the pure speed you can carry from turn to turn. Once you make a hard, surprise, uphill right turn, you'll know the ride is over, and a super steep, but thankfully short, climb starts. This climb will take you up around a water tower and ends at Stephens Pasture - uphill bypass connector fire road that goes uphill and right through a short row of wood posts, or downhill and left into the shade.
This is really a nice place to ride.
The Marshall Canyon Trail is shared with horseback riders.
Take Rollercoaster up to the water tower.
At a U-turn spot on Roller Coaster.