From a Curbed.com online article:
Rising on the west side of Napa Valley, the Mayacamas Mountains are best known for producing costly cabernets for wineries like Mayacamas and Mount Veeder. But they’re gorgeous, too, as this sprawling state park proves. For a beautiful, medium-challenging hike, follow the Redwood, Ritchey Canyon, South Fork and Coyote Peak trails on a 5-mile loop that leads through coast redwoods and up Coyote Peak to Instagram-worthy views. Then sit and snack on the sandwiches you got at Sunshine Foods in nearby St. Helena.
State Park website: https://www.parks.ca.gov/?page_id=477
To read more click on following link: https://sf.curbed.com/2019/7/24/20700994/best-hiking-trails-napa-wine-country-day-trips