Next day was spent tasting street tacos and getting lost in a couple of markets: The giant Merced market and the Jamaica market, which is largely a flower market. My favorite taco was the "mixiote," barbecued lamb cooked in a leaf of the agave plant. Very juicy and flavorful.
The following day was spent in the archeology museum, which was just simply amazing. Covering prehistoric times to the aztecs, mayans and other pre-hispanic civilizations. The pieces displayed were awe-inspiring. Most of the captions were in Spanish, so google translate was helpful.
The Aztec sun stone.
An Olmec head.
The archeology museum is in a giant park. We spent the rest of the day walking around the park and visiting the castle containing Mexico's history museum. Great displays, but the garden on top of the museum was the highlight.