Home to the old wood mill that gave Mill Valley its name, Old Mill Park features a vast array of recreational…More options. Located in a large redwood grove east of downtown, the park features a playground structure, benches, picnic tables, creek access, barbecue grills, two group picnic areas and an amphitheater with a stage.</p> <p>The park is the Mill Valley site for Film Night in the Park, a touring outdoor film night that features movie screenings in Fairfax, Mill Valley, San Anselmo, San Francisco and San Geronimo throughout the summer.</p> <ul> </ul> <ul> </ul> <ul> </ul>