Mile 0.0 - Head west on D St. Mile 0.14 - Turn right on 6th St. Mile 0.50 - Turn left on Western Ave. Mile 2.22 - At the Y, turn left on Chileno Valley Road. Mile 6.09 - Turn right and remain on Chileno Valley Road. This road has multiple small rolling hills. Mile 15.80 - Turn right on Tomales - Petaluma Road. This is a busy road. Mile 17.74 - A the T, turn right towards Petaluma. Mile 17.83 - Turn right on Spring Hill Road. This road starts off flat and then starts climbing a few hills. Three small hills and one large to follow. Mile 25.11 - Spring Hill Road turns into Western Ave. Mile 26.93 - Turn right on Keller St. This turns into 5th St. Mile 27.09 - Turn left on B St. Mile 27.15 - Turn right on 4th St. Mile 27.29 - End of ride.