I've got a few days to fill on my May itinerary and am looking for an interesting tertiary city that would be a good use of the time. While I could leave Sunday night, leaving early Monday and returning later on Wednesday is probably more practical. (And I realize that Monday means making notes on what's open/closed.) Salamanca was my first thought, but Zaragoza is a close second and a shorter, easier trip from where I stay in Madrid.
I enjoy a full mix of experiences: art, architecture, history, strolls, and terrace time. Nice food is nice, but not a driver. I like to feel like I've had sufficient time to properly explore wherever I've been (which is why some of the bigger destinations I have yet to explore are off the list.)
Thoughts on the two, or alternate ideas, would be much appreciated.