Use the same rules I follow when travelling alone in foreign countries.
Day light is safe light.
Darkness is not my friend.
If you have to be out after dark, familiarize yourself with the surroundings ahead of time. How do I get in and how do I get out.
Do not hang out with stupid.
Stay out of bars. 99% of the stories of misfortune begin with the line, "We were at this bar and.........."