An Ancient Colonial Mountain town
"Trying not to be a Gringo"
As a novice international traveler, I was fairly comfortable in San Miguel, since there were Norte Americanos at every street corner. There are taxis everywhere (all Nissans: what's up with that?), and travelling by taxi within the city costs about twenty pesos (though some will try for more). The city itself is fairly compact, and you can walk almost everywhere, but beware: the ancient cobbles can be very hard on your ankles. Hiking shoes will help.
The central part of the city is lovely but a bit on the touristy side. It is a popular destination for Mexicans in the summer, because of its elevation and mild temperatures. There are swarms of people trying to get your money, from small children who tug on your shirt and hold out open hands to tiny old ladies curled in doorways who open their hands as you pass them by. If you walk a little farther, the scenery becomes more authentically Mexican (no trinket shops, only bodegas, and plenty of rebar sticking out of the tops of buildings).
I felt very safe wherever I went in San Miguel.