Mexico City Hop-On Hop-Off Tour. See Mexico City’s major attractions with this hop-on hop-off bus tour. Travel by an open-top, double-decker bus on this comprehensive sightseeing experience that covers the Zócalo, Revolution Monument, world-class museums, buildings and more highlights. Buses run regularly from morning until night, giving you the flexibility to explore the sprawling metropolis at a pace that suits you. Book with us and Save 29%! Mexico City Hop-On Hop-Off Tour.