If you want to visit Mexico city, I recommend you to take the hop on, hop off bus, and you will know some of the nicest places in the city, because it is a so large city so it is impossible to visit all the nice places during a holliday trip, and this two-day tour will show you nice places in a safe way, and you may walk around the bus stations, and you will always have a safe bus to move through the city. You may visit museums, churches, small towns inside the big city, etc. I am sure you will not regret to visit my country. Welcome to my beautiful Mexico. Regards