If I were a mugger, I would surely go for easier pickings than a man of your impressive dimensions. It would also occur to me that you might be an off-duty cop. But there are crazies out there who don’t think like that because their need for immediate cash is much greater than their common sense, so do what is suggested by the guys above.
For a short time, I was an organ courier. I had to take self defense and situational awareness courses before I could get on board. It was vital that the transplant organ made it from the donor hospital to the recipient hospital and not be sabotaged by some junkie in an airport after the money for his next fix. The most important part of these courses were not the actual techniques of physically neutralizing a perp, but situational awareness and even how to not walk like a victim advertising to be mugged. The best defense is to cause the perp to pass you by for easier prey.
Like Tropical Willie said, always walk as if you know exactly where you are going. Nighttime is not the time to aimlessly wander around and sightsee, or look like you are doing so. That screams of lost tourist and easy pickings.
Demeanor
Victims of violent crimes like a mugging or robbery call attention to themselves by either being oblivious to their surroundings (defenseless) or by looking helpless (unable to defend themselves).
Walk down a street with your head up and looking around. Walk tall, don’t stoop, look confident.
Don’t hug either side of the sidewalk, especially not the inside where you have to pass close to doorways.
For God’s sake, don’t text and walk or be talking on the phone. It is obvious that your mind is somewhere else and the mugger knows you won’t know what hit you. Don’t become absorbed in any electronic device while on mass transit. You’re screaming out “ROB ME!”
Don’t stare (it can be taken as a challenge) but don’t be afraid to look at people (it isn’t an elevator). You can nod or smile if you’d like, but beware of offering an unintended invitation.
Situational Awareness:
Try to pay attention to the unusual when out walking.
Has that person been behind you for a while?
Do they stop when you stop and continue when you do?
Do they look away when you turn to look at them?
The easiest thing to do is go into a public place, like a coffee shop or an eatery, and have a seat…if they stop too, you might consider calling 911 and have them check out your stalker.
The worst thing to do is continue on your way is it takes you to a less traveled area…if you can’t stop; take a longer but busier route