I took a cab to the "Zona de los Fuertes" because I'm a history buff, and I wanted to see them. Guadalupe was closed, but there were some nice views. Loreto was fantastic! A beautiful structure, and a very nice little museum. I thoroughly enjoyed my time there, and I was the only tourist there. The $46 peso entry fee seemed fair for the museum.
Afterwards, I walked back down the hill to the Centro. It's not too far, and a nice walk.
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