With upscale Mexican cuisine, reasonably priced wines, and a full-service sidewalk patio on Chestnut Street, it’s easy to see why Mamacita has become one of the most popular happy hour San Francisco restaurants. With pitchers of mojitos and margs, two large communal tables, and a constant flow of boisterous groups, it’s pretty much a fiesta from open to close (especially on weekends). With a fresh, local, and sustainable philosophy, the food is worthy of the hype. Expect authentic and seasonal cuisine from the kitchen, including chilaquiles, albondigas en pozole, and mahi mahi tacos. A festive atmosphere with tasty, authentic food, and prime people watching from the sidewalk patio. The bustling crowd at smallish Mamacita spills over onto the sidewalk patio most nights, filled mainly with groups of Marina scenesters who keep coming back for pitchers of pomegranate margs and fresh guac. Mamacita allows plenty of tables for walk-ins, so it’s an ideal spot to grab a (weeknight) bite after a sunset tour of Crissy Field and the Palace of Fine Arts. On weekends, though, reservations are recommended.