Stay away from places you aren't supposed to be.
It seems to me like a large majority of people who get into trouble are somewhere they probably shouldn't have been anyway. I know, I know... It's a free country, so anyone should be able to go anywhere they want without fear of being accosted.
Should be. But there are a lot of things that should be that don't necessarily jibe with reality. And don't get me started there.
Ahem. Back to the original point.
If your instincts say 'don't go there', then you probably shouldn't go there. Convenience stores late at night, the bad part of town, inside stranger's vehicles, poorly lit parking lots...
When I was younger, I ended up in places doing things that instinct told me was a bad idea. I got extremely lucky. Getting into a car with a guy I only just met in one bar to go to another bar, thus leaving the safety of my friends' company and the ride I came in to waltz off with stranger dude. Lucky for me, he took me home when I asked. Which brings me to the other stupid thing - I let him take me to my home, so if he had been a psycho, he then knew where I lived. Or the many times I spent walking city streets alone at night. Not smart. Lucky, but still not smart. (Hindsight is 20/20 after all.)
Listen to the voice that tells you this is a bad idea. (And it'll talk to you if you haven't drowned it in alcohol. Jus' sayin'.)
And stay safe out there.