I honestly think if you follow these rules you won´t have any severe problems, even if you´re visiting a country like Mexico!
TALK TO LOCALS.
Ask them where to go and from where to stay away. I never walked in a city I didn’t know without doing that before!
DON´T WALK OUTSIDE AT NIGHT.
Not alone, neiter in small groups. In most cities in Mexico you’ll find Uber or Didi (a new app, quite the same as Uber), in some cities they are prohibited.
There you’ll have official taxis. They all look the same and are supposed to be safe.
Anyways, if you take them alone, let your friends know! With Uber and Didi they can follow your exact location if you share your ride and if you’re in a taxi just share your location via Whatsapp or at least let them know when you’re home.
DON´T SHOW WHAT YOU HAVE.
Avoid to wear brand-name clothing and conspicuous jewelry and don’t carry your iPhone or camera openly.
BE CONFIDENT OR AT LEAST PRETEND.
There were not a lot of situations I felt unsafe in Mexico but when I did, I pretended to know exactly where I’m going, what I’m doing and that I’m not scared at all. This didn’t only actually give me confidence, I’m convinced it as well kept away uninvited followers.
Especially as a girl even if they don’t mean to scare you, it might make you feel uncomfortable if guys whistle at you. That happens in Mexico and although you cannot change it, I personally enjoyed the embarrassed faces when I answered with an angry look or even a short super-mexican frase like “Que onda?” because they simply don’t expect that.
STAY AWAY FROM DRUGS.
I told you where the issue of insecurity comes from in Mexico. Now it’s your responsibility not to get involved.
DON´T DRIVE AT NIGHT!
Especially if you’re in Mexico for touristic purposes you might end up in regions like Baja California or Chiapas. There and in many other parts of the country you’ll encounter yourself on very lonely roads. Distances in Mexico are not compareable to Europe and sometimes you won’t pass a bigger city for hours. On roads like these you´ll likely be stopped by street blockades of different types and be robbed (or worse) on the way as you cannot elude.