Hesitantly I would call this Part I, but we're not sure when Part II will be, so I'll leave it as is. Our introduction to Mexico City was on the Turibus- a hop on hop off tour to see the main sites downtown. Our favorite stops were: Condesa- a hipster neighborhood with lots of restaurants and bars, and the Palace de Bellas Artes with famous murals of Deigo Rivera and others. We did however hit up the must-have stops: Fuente de Cibeles (copy of the one in Madrid), the Angel monument of independence, the Zocalo historic center with the main cathedral, and La Reforma Blvd. with all kinds of benches and statues. Overall a good introduction, although far from a raving recommendation.
On the Turibus:
Fuente de Cibeles:
Fifa Fan fest (where they showed the world cup games)...
in front of the Cathedral.
Cool bench on Reforma Blvd: