Day off work / time out with Liz, wandering around the Centro Historico. Partly to check out several supply shops for Liz's silver-smithing (tiny Aladdin's caves above shops which you'd otherwise have no idea they were there), partly to see a couple of exhibitions (Tate Landscapes at MUNAL and a history of the bicycle at Franz Mayer Museum), and partly simply to have some time to ourselves.
The BICI exhibition was great: bikes through the ages, imaginatively laid out with interesting stories about their history in Mexico. It included an orange Chopper from the early 70s. I had one of these, a brilliant piece of design. It still looks modern.