Start at a brown gate in front of you and begin riding overgrown doubletrack which is essentially an old logging road. You'll see an obvious bike trail the entire way.
You'll encounter two more gates throughout this ride. Go around all to the left. After the third and final gate, you'll be back on a gravel road that has some fun straightaways where you can easily hit 25-30 mph without fear of a root or rock coming at you from nowhere.
The gravel road will eventually intersect back with Fish Hatchery Road.