When you arrive to Mexico City, I would recommend that you to take the so-called Turibus on one of your first days, as it gives you a great overview of the city and the opportunity to visit the most important sights in just one day. The bus connects the Bosque de Chapultepec, which is a huge park and is sometimes referred to as the lung of Mexico City, and the Zocalo; the main square; and the historic center both ways. The bus itself is an open double-decker, and it is operated on a hop-on, hop-off system, so you can get off at any of the stops and get on the following bus any time later. This way you don’t only see the sights from the bus and listen to the tour guiding in six different languages (Spanish, English, French, German, Italian, and Japanese), but you also have the chance to explore the areas you are more interested in by walking around. The price of the day ticket is 115 pesos, and you can get off and get on the bus as many times as you want within the day. The main sights visited are the Auditorio Nacional, the Bosque de Chapultepec, the Angel of Independence, the Cathedral, the historic center, the Zocalo, the Zona Rosa, the Condesa Roma zone, and much more.