From Napa:

*Please note that the travel times shown on the map are calculated using real-time traffic conditions at the time you open the page. Actual travel times will vary depending on your exact starting point and the current traffic conditions at the time you leave. Estimated travel time from Napa without traffic is just over thirty minutes. For more information about the estimated travel time for a specific day and time, or for alternate routes, please click on "More options" in the white box at the top of the map.

Head south on CA-29 to Vallejo/San Rafael.
Turn right onto CA-12 W/CA-121 S/Sonoma Highway and continue for 5.1 miles.
Make a slight right onto Napa Road and continue for 4.4 miles.
Go straight at the Broadway/CA-12 intersection to continue onto Leveroni Road.
Continue for 1.8 miles.
Turn right onto Arnold Drive and continue for 3.6 miles.
At the traffic circle, continue straight to stay on Arnold Drive for 2.7 miles.
Sculpturesite Gallery will be on the right, inside the historical Jack London Village. There is one small parking lot on the south side of Jack London Village as you approach, and one larger parking lot on the north side after you drive by. All parking is free.