A great bike-to winery, Bartholomew Park occupies a 375-acre preserve, with oak-shaded picnicking and valley-view hiking. The vineyards were originally cultivated in 1857 and now yield certified-organic, citrusy sauvignon blanc, cabernet sauvignon softer in style than Napa, and lush zinfandel. Tours (reservations required) are available Friday to Sunday. Bottles are $22 to $45.