I don t know from which planet you are coming from. But it is from earth, I suggest you to educated yourself about your neighborhood and the risks you will be taking by walking at night. I assume you are a man. If a woman, she will know by instinct it is not safe to walk alone at night anywhere.
I agree with Jasonit. Every city can be dangerous. Find out from your hotel or friends what areas not to visit in the night. Dont go alone. Advise your friends or family by cell phone when you start your walk. Have a local Police number programmed in your phone. Look like you own the place, always walk with confidence. If anyone approaches you anywhere in the world, just tell them you are on the way to meet a friend, who is expecting you.
Like most countries and cities there are nice parts and dangerous parts. Detroit is known for having some pretty dangerous areas so make sure to ask a local you trust. I would also suggest not walking alone.
save your energy and shoot yourself now.