It is not recommended to stay after dark in the Centro historic. The western part of the city is poorer and rougher than the eastern half and the chances that travelers end up there is low. Beware of purse-snatchers and pick pockets when you are visiting around. Caucasian tourists could be a target to be mugged. In general don’t show off too much and be careful of insincere people who may try to be friends with you so they get money out of you and travelling with a tour guide can help avoid these situations. Conchos are popular form of public transportation, be cautious of the pirates, unlicensed cars roaming the streets, always negotiate the charges in advance.