At long last I stumbled on the public library, parked next to another motorcycle, and went inside for some blogging. Then I wandered into the Plaza and had a look around.
The Governor's Palace has been turned into a museum, and although I didn't buy a ticket for the interior exhibits, the entrance hall had a little bit of information.
The aforementioned market was in progress.
Santa Fe was lovely, with classic adobe architecture, beautiful weather, and a friendly old man in the park who talked at me for an hour about his life and travels, and highly recommended that I visit Peru.