Visit three wineries in napa valleys northern regions of calistoga and st helena on the napa valley wine trolley traveling on a motorized replica of a historic san francisco cable car youll head north of yountville to castello di amorosa a winery modeled after a 13th century tuscan castle that you can tour then visit two more premium wineries and enjoy a picnic style lunch from a local grocer a knowledgeable guide will provide fun facts and information about napas famous wines must be