One day
Start in El Centro at the Jardín de la Unión, see Teatro Juárez and the yellow Basilica, then ride the funicular up to El Pípila for the panorama over the coloured city. Walk back down through the callejones to find the Callejón del Beso, graze lunch at the Mercado Hidalgo, and spend the afternoon on the museums — Diego Rivera's birthplace or, if you dare, the mummies. After dark, take a café table on the Jardín and join a callejoneada.