Safety- It's pretty safe these days but like anyplace there are pickpockets. So we hide our valuables. The best method that I have experienced for keeping your most important valuables safe is in an additional pocket that hangs down your pant leg. A friend of mine made her own. It's simple to sew two sides together just wide enough to stick your passport in, perhaps an atm card and a little cash. Then take a big diaper pin and pin it to the inside of your pants or skirt. It's always there and you can settle your nerves because it's easy to feel it with your hand.
I like this better than a neck strap because as a photographer I don't need anything extra around my neck. I like it better than the waist belt because i can't feel that it is there sometimes and that makes me nervous. Also a waist belt can be uncomfortable when sitting and it bunches up.
I'm going to make one soon and then I'l post it. They are also possible to buy online ready made for about $20. They are called pocket passport bag. If you have a travel Photography tip please share it here.