The San Geronimo Valley is made up of Woodacre, San Geronimo, Lagunitas, Forest Knolls and the town of Nicasio. These towns stretch along and out from Sir Francis Drake Boulevard as it winds toward the beach communities of West Marin. Each area has it own personality and community vibe. Woodacre offers hillside homes with sweeping views and lots of privacy. San Geronimo has a more active feel with horse properties, small businesses and pockets of planned developments. Forest Knolls and Lagunitas feel more rural and rustic with bordering streams and open space areas. Nicasio is a destination all to itself with a town square and semi-famous local bar and restaurant that hosts well known bands and intimate weddings. Spirit Rock offers a door to an inner world. You can explore more here.
The outline here shows San Geronimo. You can also explore Woodacre, Forest Knolls, Lagunitas and Nicasio.