ST. HELENA. This casual Mexican eatery isn't just known for its fresh, tempting fare ­ it's also celebrated for its fun karaoke nights and weekend lineup of live music. Grab one of their famous margaritas and head to the dance floor, where you can get down to the best local rock, reggae, dance hall, funk, and R&B on Fridays and Saturdays. Thursday nights are dedicated to karaoke ­ perfect for a group of friends. Every third Sunday is open mic night, so warm up your voice and join the party!

RUTHERFORD. While the inviting fireplace might draw guests inside on the coldest nights, you can be sure that the expansive, wraparound deck with its magnificent views of Napa Valley is this bar's main attraction. Drinks are pricey, but the appeal of sipping champagne or one of 25 by-the-glass wines at this romantic hotel bar is strong. Sunset is the most popular time to attend, but the bar is open from late morning onwards. Food served includes a delightful spread of gourmet nibbles and main dishes; try shrimp spring rolls or a grilled Angus burger and pommes frites with your vino.

NAPA. Young locals usually pack this little joint, but the relaxed atmosphere welcomes everyone in for a few drinks, including the tourist set. The appeal is simple: strong mixed drinks, priced to sell. Occasionally, live, local music and a DJ keep things animated; call ahead for the schedule.

YOUNTVILLE. Adjacent to extremely popular Hurley's restaurant is this gem of a bar, an exercise in understated elegance. Dark woods and a high ceiling create a refined space that opens onto a pleasant patio, shaded by hanging greenery and umbrellas. Wines by the glass are priced reasonably, and cocktails and beers are also available. Naturally, the food is amazing, even the late-night menu ­ options include Belle River crab cakes, a grilled venison sandwich, and a variety of tantalizing desserts. Great people-watching, too.

CALISTOGA. More than just a great place to grab lunch or dinner, Hydro has evolved into a happening weekend nightspot. Known for its great beer selection (truly a distinction in the wine country), Hydro offers 20 microbrews on tap, along with well-poured cocktails. On Fridays, Saturdays, and Sundays, you can hear live jazz and blues starting at 9pm (7pm on Sundays). You don't have to go hungry, either ­ salads, sandwiches, and a filling array of appetizers stand at the ready.