I am being asked to go to Mexico for work and would quite likely be traveling alone. The trip would involve visits to Mexico City, Guadalajara, Puebla, and perhaps Monterrey. I do not speak Spanish, unfortunately. Questions: 1) Is it safe? 2) What kind of transportation and/or security should I ask for? 3) Any other travel precautions? In the grand scheme of things, this trip is not super-important, so I think I can get out of it if need be. Thoughts? Advice?