Mexico City

Roma for the walk, one museum, and tacos that do not need a reservation.

Good to know

Go: Stay in Roma or Condesa. Use the metro or a walking radius, not a car across town.
Skip: Skip a second rooftop. The first view is the one you needed.
Eat: Tacos at a street stand with a crowd. Ask for the salsa on the side if you are unsure.
Entry: Mexico lets many passports in for tourism without a visa. Confirm yours, including any onward-ticket rule.
Timing: June to September brings heavy afternoon rain. February, November are easier.

Street tacos
$8
Roma · evening
Two tacos, then decide if you want two more. The stand will still be there.
Parque Mexico
Free
Condesa · morning
A loop of the park is enough. The Saturday market spills onto the paths.
The centre on foot
Free
Centro · morning
Zocalo, then one museum. The cathedral is the free stop.
Anthropology museum
$10
Centro · afternoon
Pick two halls. The whole building is a second day.
Coyoacan afternoon
Free
Coyoacan · afternoon
The plaza, then a coffee. Frida's house needs a timed ticket.
Trajineras in Xochimilco
$25
Coyoacan · afternoon
Agree the boat price before you sit. Food on board is extra.
A bar in Roma Norte
$18
Roma · evening
One round. The bill grows when the table orders for the table.
A market lunch
$10
Centro · afternoon
Eat what is already on the comal. A custom plate takes longer and costs more.

A typical cost in US dollars, so you can decide before you open a booking site. Not a live fare.