Debt of Gratitude (DoG for short) takes advantage of the rich network of trails in China Camp State Park, situated just outside San Rafael on the edge of the Bay. The park is characterized by moderate grades and smooth, fast-running singletrack. Many variations of routes are possible here, including shorter, but given that the terrain is relatively gentle, DoG remains a good choice for intermediate runners despite the longer distance. To start this run, follow N. San Pedro Rd. heading West from highway 101 in Marin. Drive 4 miles then park on the side of the road near the park gate.

Start the run by picking up the Bay View Trail heading South just inside the park gate. Skirt along the base of the ridge then follow the trail as it climbs 400 feet, switching-back through the cool coastal forest. Continue on the Bay View Trail south along the ridge after it merges with the Powerline Trail, taking advantage of fast swoopy singletrack the whole way. The Bayview Trail follows the contour of the ridge for approximately five miles, curving eastward until finally dropping gradually back down to the flats by the Bay. Once off the ridge, turn left (North) on the Shoreline trail. Run this generally flat, wide, and easy to follow trail for 3.5 miles as it traces the base of the ridge through the park and right back to the car. Source