Begin the trail at the Leonard Andrews Tennis Center, which is located to the rear of the St. Jude Medical Center. Follow the trail down into the canyon and then turn left, making your way north. Eventually you will run into two tunnels going under Bastanchury Road. At this point, you can either forego the tunnels and continue on to the Lost Trail, which will lead you to Trail Rest Park. Or if you decide to go through the tunnels, they will lead you to the Fullerton Municipal Golf Course.