One is in the historical Zocalo Centro where you can see Constitution Square, the National Palace, the Metropolitan Cathedral and many intersting streets full of shops and restaurants.
This map shows the approximate boundaries of our Zocalo Centro scavenger hunt.
Other recommended locations are the hip Condesa and Roma Norte areas. These safe neighbourhoods feature cafes, restaurants and noteworthy architecture as well as the old hippodrome.
Here is a map showing the boundaries of the Condesa Scavenger Hunt in Mexico City: