Quick answer
Five days follows the same route as the 3-day itinerary (Centro Histórico, then Chapultepec and Polanco, then Roma/Condesa) and adds two more: a full day trip to Teotihuacán on day four, and a lighter closing day in Coyoacán on day five. There's still no room for a second day trip at this length; that's what the 7+ day version adds.
Five days doesn’t change the first three. It adds two more on top: a day trip on day four, and a lighter, closer-to-home day on day five rather than a second big push.
Days 1-3: the same foundation
Follow the 3-day itinerary exactly as written: Centro Histórico on day one, Chapultepec and Polanco on day two, Roma/Condesa on day three. Nothing about that route changes here.
Day 4: Teotihuacán
- Morning: Leave early, by 7 or 8 a.m. if you can manage it. The pyramids are roughly an hour outside the city, and both the heat and the crowds on the Pirámide del Sol and Pirámide de la Luna build fast once the day gets going. See Teotihuacán: How to Get There and What to Expect for the specific transit options, bus, tour, or car.
- Midday: Walk the Calzada de los Muertos at your own pace and climb whichever pyramid you have the legs for; doing both back to back wears most people out faster than the distance alone suggests.
- Afternoon: Head back toward the city. Between the drive both ways and the climbing, this day doesn’t leave room for much else once you’re back.
- Evening: Keep it close to your hotel and low-key. A day trip stacked on top of three days of walking adds up by this point.
Day 5: Coyoacán
- Morning: The Museo Frida Kahlo (Casa Azul) is the main draw, and it sells out its timed-entry tickets days or weeks ahead during busy periods, so book before you land rather than counting on walking up.
- Midday: Mercado de Coyoacán for lunch, tostadas in particular are what the market is known for.
- Afternoon: Jardín Centenario and Jardín Hidalgo, the two plazas at the center of the neighborhood, plus the colonial streets around them. This is a slower, shorter day on purpose, closer to the city center and easier on legs that have already done a lot of walking this week.
- Evening: A last dinner wherever you’ve been staying, rather than starting something new on your final night.
What this trip skips
Still just one day trip. Xochimilco, Puebla, and Valle de Bravo all stay off the list at this length. The 7+ day version is where a second day trip, or a neighborhood that never made this list, finally has room.