Body language is understood across cultural lines. If you feel that something isn't right, then chances are something isn't right. Look around and see what's wrong and avoid it. Listen to that little voice.

Teach your kids to be aware of what is going on around them. Just showing that you are aware of your surroundings lessens threats.

And that Stranger Danger stuff is mainly crap. More children are hurt/abused/molested/killed by people they know already than by strangers.