This will be a ride from Airport Blvd. traveling a south western meandering route back to Petaluma.  You will need to catch the 8:24 train in Petaluma to arrive at 9:00 at Airport Blvd. to begin the ride. The ride will be 37.8 miles with 1571 ft. of climb.  Don't forget you will need a Clipper Card.  

Here's the route:       https://ridewithgps.com/routes/40718624