Napa Valley is a famous wine region located in the area known as North Bay, about 90 miles north of San Francisco, California. The valley hosts about 300 wine producers spread over 48 square kilometres through the counties of Napa, Yountville, Rutherford, St. Helena, and Calistoga. A visit to Napa Valley is the perfect excuse rent a car, cross the Golden Gate and an ideal opportunity to enjoy a lovely day trip.