We will take the 8:19 southbound Smart train to the Larkspur Station.  The ride will be a loop from Larkspur to San Francisco.  We will ride thru the Sea Cliff area to the Palace of the Legion of Honor and out to the Cliff House.  We will then proceed along Ocean Beach to Lake Merced and end up in Daly City for a lunch/refuel stop.  Then it's back thru the avenues to Golden Gate Park.  We will ride east thru the park and  ultimately end up back in the Presidio. Thru the Presidio and then the reverse route back to Larkspur.  Depending upon our pace/energy we will catch the 2:23 or 2:55 train home at the Larkspur station.  If we miss either of those it's only a short ride to the San Rafael Station to wait for the next train where cold drinks are available near by.  The ride is 50 miles/2565 ft.   Here is the route:     https://ridewithgps.com/routes/40975619