I was surprised the ship left without us because when you're on a cruise-organized shore excursion, it is supposed to wait for you to get back, even if you're running late.
As an older woman, one country I loved traveling on my own to is Ecuador. I stayed in small towns and found the people welcoming... Safety becomes less destination-specific and more about being aware of where you are and the potential risks. When you treat others as you would want to be treated, the world is a welcoming place.