When we travel alone, we often chose to eat at the restaurant’s bar as to not stick out as a single person at a table.
Also, protect yourself in your hotel room by looking through the peep hole before opening the door if someone is knocking.
Adventurous Kate has some more good advice here: http://www.adventurouskate.com/top-10-travel-safety-tips-for-women/
Lead. Travel. Pray. 