Learn about the history of an orchard originally planted in 1908-1912 at the Jack London State Historic Park, followed by medium-effort, 6-mile (roundtrip) hike (optional). $15 per person. $10 parking. 9 a.m.–1:30 p.m. Jack London State Park. 2400 London Ranch Rd., Glen Ellen (turn right after kiosk).Tickets: tinyurl.com/yfnnne93.