Stay safe and happy when you travel solo
First and foremost, carry yourself with assurance:
I always carry a large bag that zips or closes, usually slung across my body — which gives me room to get into the bag without taking it off (convenient) and also deters anyone from even thinking about ripping it off as they zoom by on a motorcycle or run off with it. Less fussing and worrying over your bag is always a good thing. My grandma, a solo traveler herself, taught me this. She would also keep a file card with exchange rates pinned to a convenient place in her bag so she wouldn't be taken advantage of when shopping!
Obviously, expensive jewelry is always a no-no; basically look at what the locals wear and try to mimic it so you blend in visually to the local vibe. I have often done this so successfully that locals speak to me in French, Spanish, Portuguese or Italian, which is the ultimate "fitting in" test! In most countries, a wedding band is plenty to keep men from hitting on you overtly, though I've never worn one since I'm not married, and never felt like I was treated disrespectfully. (Some solo women travelers swear by the wedding band though, whether they are married or not.)
Traveling with at least one other person at night, whether a man or woman, should be enough to make everyone feel safe and to keep away the crazies (who are — let's realistic — everywhere). I've never felt uncomfortable walking places solo in the daytime, and while I've never been to a war-torn nation, I have visited those places where Americans weren't exactly favored, and I've never had a problem as long as I was dressed appropriately for the locale and was walking confidently.
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