Mexico City is all about the street food, the massive parks, and the energy in neighborhoods like Roma and Condesa. Visiting during the week instead of the weekend can cut your flight costs significantly, leaving you more to spend on tacos and museum entry fees.
A trip like this usually runs around $1800. If you use the Discover it® Cash Back, you get a 0% intro APR for 15 months on purchases. This means you can pay for the trip in chunks without paying extra in interest charges.
The 0% intro APR is a deadline, not a gift. If you still have a balance after 15 months, the bank will start charging interest on whatever is left, which gets expensive fast.