Parks in the Valley of the Moon, Sonoma County, California The Valley of the Moon. Jack London State Historic Park Highway 12 runs east from Santa Rosa to the town of Sonoma through the Valley of the Moon, bounded by the Mayacamas mountains on the north and Sonoma Mountain to the South.
Extensive vineyards stretch along the highway on both sides.
Closed during the fire season and on week-days. Open week-ends and holidays. Sugarloaf Ridge State Park , located north of Highway 12 on Adobe Canyon Road, offers 49 developed family campsites, a group camp, picnic sites, and 25 miles of hiking and riding trails. The coastal mountain terrain of the 2500 acre park has a range of elevation from 600 to 2729 feet, with the camp and picnic sites set in a large valley with meadow and stream at 1200 feet. Favorite activities are camping, resting, hiking, nature exploration, and horseback riding.