I did that the other direction, a good bucket list item. Went to Cartagena with no problems at all and that was the only place I was the least bit fearful of. I took a time lapse set going through one of the locks, going up and down and passing other ships going the other way. I had the camera where everything in the field of view was changing. Doing it again, I would include some of the patio to anchor the image.

For every new location you go to, take a few pictures of signs to help you remember which country and city you were in, they all begin to look the same after a few weeks.

As some one said, no flashy jewelry or expensive watches visible. A waistband wallet to wear under your clothes for money and passport is wise. Don't carry anything in your wallet that you can't afford to lose, just to be safe. A bottled water sling is helpful so you can stay hydrated and not depend on local water.

Enjoy.

Anytime I am on a cruise, at each stop, I go to the taxi stand and ask a driver to take me to see the area. I tell him/her I want to see the tourist places, of course, but I want to see mostly sights and areas the natives know about. I have never been disappointed, nor have I ever felt unsafe or misused in charges. And generally I pay less than the tours the cruise line was trying to sell me. Of course, when you approach the cab you need to ask, "Do you speak English?" Then listen to how clearly he/she answers. And also, "What would you charge me to tour the tourist places, but I want to see mostly areas the natives know about?" Just a suggestion for your consideration.