The temple complex at Chichén Iztá is famous around the world for a reason. The sheer size and sprawl of it; the precision and the unique features, both in the visuals and the auditory effects hidden in the architecture - all of these come together to make an intense experience. I kept waiting to be annoyed by the groups of tourists clapping in front of Kukulkan in order to hear the sharp pingback sound from the large and imposing temple, but I was simply awed every time.
There are scores of vendors throughout the site, selling variations on the same few handmade items; on this day, however, most people were there for the special dance of shadows on Kukulkan's side that happens only on the equinoxes. So many people were gathered for the twice-annual event!