Monday, the museums are mostly closed, so we scheduled our tour to the pyramids. The day starting with a sunrise balloon ride over the pyramids. My first hot-air balloon ride and it was amazing. The pilot went up about 2000 feet, then brought the balloon down to very close to the pyramids.
Pyramid of the sun.
Close flight towards the pyramid of the moon.
We also had a tour of the pyramids on the ground, but the balloon view was the highlight. You can climb the Pyramid of the Moon partway to get a great view of the entire site, but it gets hot very quickly. We paid extra for a guided tour, which was well worth it, because there are no signs or other explanations of the site. The tour had a tourist trap Mezcal and Pulque (fermented agave drink) tasting, which was fine, but my advice would be to buy any alcohol in the city at more reasonable prices.
Back in the city, we spent the afternoon in Polanco, which was nice, but kind of a soulless financial district. The Soumaya museum containing a variety of art from around the world was nice (and free).
Soumaya art museum
Next day was spent in Coyoacan, a beautiful residential neighborhood, where we explored a wonderful market, visited the Frida Kahlo museum and stopped by Leon Trotsky's house. The highlight was the Frida Kahlo museum - really her and Diego Rivera's house. There is some art, but the majority of her work is elsewhere.
There's a reason why it's called "casa azul".