I often take them when I am heading straight down the Reforma, the city's main drag. Hotel cabs are often double the price of the independents. Either way, your concierge can write down your destination in Spanish if you are unfamiliar with the language. Language and Safety Always carry a dictionary with you, and it never hurts to learn a few words of Spanish before you leave. Now, let's talk about safety.
Most cities have their own safety problems and Mexico is no different.
Play it safe by not displaying signs of wealth while walking in the city. Money belts are ideal for carrying credit cards and cash. If you have valuables, and I consider both my passport and airline ticket in this category, put them in the hotel safe. You do not need your passport when shopping or touring, but carry a Xerox copy just in case. A fanny pack worn in front, with a jacket over it, is an easy way to carry personal items.