South Napa's Taco Bell at Soscol and Imola avenues is open late for "Fourthmeal," including until 3am on weekends. It offers the tacos, burritos and other familiar fast-food Mexican-inspired menu items this chain is famous for. This location also serves "Drive-Thru Diet" items, all with under 9 grams of fat. See the Taco Bell Web site for current special offers and nutritional information.