This is the route of the Saturday 8am Bridge Crew, a fun group, but I get dusted when things devolve into “shenanigans” around Point Reyes.
All manner of terrain makes this a spectacular ride.
The very first rides I did when I first came out to the Bay Area were from Mike’s Bikes of Sausalito (Marin City) to Nicasio and back (~21 miles of this loop).