Museo Rafael Coronel
Concealed by the former Convento de San Francisco's mellow, pink, 18th-century facade is a rambling structure of open, arched corridors, all leading through garden patios to rooms that exhibit, on a rotating basis, 3,000 of the museum's 10,000 máscaras (masks). These representations of saints and devils, wise men and fools, animals and humans were (and still are, in some parts of Mexico) used in regional religious festivals. The museum also has a remarkable display of puppets, pre-Hispanic art, photography, and paintings.
Because the collection can be overwhelming and the grounds are very pretty, you might take a snack and enjoy a small outdoor break during your visit.