San Diego is known for its extensive selection of authentic Mexican food, and because of its proximity to the Mexican border, Taco Tuesday is somewhat of a religion. One day a week, San Diegans gather in local taco shops, bars, and authentic Mexican restaurants, united by one thing: cheap tacos. Navigating through the diverse and at times overwhelming list of Mexican restaurants in San Diego can be a hard task, but once you find the right spots to enjoy cheap tacos and cold drinks, it's worth it.