World-class food, walkable neighbourhoods, and prices that still feel like a mistake.
This is a shape, not a schedule. Each day has two anchors and a lot of slack, because 3-day itineraries that book four things a day fall apart the first time lunch runs long. Move things around freely — the neighbourhoods are grouped so that walking between stops actually works.
This is one of the best group cities anywhere — big tables are normal, Xochimilco is built for a crowd, and costs are low enough that budget mismatches stop mattering. Keep a shared list of everyone's saved taquerías; you will not remember the names.