I always travel solo with the exception of one international trip every year, and I wouldn't have it any other way. Traveling solo allows you the freedom to make your own choices and set your schedule. I have never had an issue traveling alone as a female, and I believe it's because I follow some simple rules.
I plan every detail of my trip, typically bed at an Airbnb with an occasional hostel stay, and use public transportation or walk once I arrive. In my opinion, being organized prior to departure is key to a successful journey.
*Question potential Airbnb hosts prior to booking to find out what their neighborhood is like in terms of returning home alone at night. Also ask if they know how late buses/trains run, and how close they are to a bus/metro stop.
*In addition, do your own checking by looking at a map to see what is in the immediate area.
*Leave the Airbnb host's name and address with a loved one as soon as you place a booking.
*Plan all your public transportation and/or walking routes with a trip planner.
*Add at least one local cab company as a contact in your phone in the event of an emergency.
*“Check in” on social media every day so that friends/family know your whereabouts.
*Never carry a lot of cash or more than one credit card when out and about. I conceal one or the other in something like an Altoids container in the event I am pick pocketed.
*I never have more than two alcoholic beverages in one sitting.
*While I'm friendly and love to chat with people (part of the reason I travel is to meet locals), I don't share with anyone where I'm staying or make a big deal about being a solo traveler, especially if I'm at a bar.
*Use common sense – don't walk alone late at night, and if something doesn't feel right, go with your gut.
P.S. Don't forget to have a marvelous time! Be curious. Be adventurous. Try a new food or activity. As you can see by looking at my photos, I always have fun and occasionally meet a new friend;)