Always arrive at roadblocks before noon, because in the afternoon the soldiers manning them are invariably drunk and abusive.
Learn French and Spanish, and then some other foreign languages. And learn to say, "Don't shoot, I'm a reporter," in at least a dozen. This might help but is no guarantee of your safety.
Take lots of notes and reread them as soon as possible, before they're lost beyond any deciphering. Or maybe that's just me. Recorders are tiny and reliable now; carry one, and you'll be amazed at what you thought you didn't miss.
If you are left-handed, learn to eat with your right in Islamic and Hindu countries, especially when gathered around a common platter. The left hand is for postprandial hygiene, and you may lose it if you thrust it into someone's lunch.
Carry lots of cash, dollars and euros, but keep it somewhere sneak thieves, bandits, and customs officials are not likely to look. They know about socks and money belts. Get a tailor to sew secret pockets in pant legs or jackets.
It is often insulting to refuse someone's food or water. It can also be seriously painful to accept. If the proffered comestible is merely disgusting, suck it up; if not, find some tactful excuse not to partake. Do not make a face or say, "Eeeyeuw.
"Despite certain novelists' do-it-the-hard-way approach, try to get a visa and cross at border posts. If you are a reporter or a spy or have overriding reasons to skip formalities, use your judgment. Just remember that some countries hang people.
Put together a medical kit, including a range of antibiotics, field dressings, and antiseptics. Take lots of Lomotil or Imodium; few miseries compete with a long plane or bus ride, rebellious bowels, and no WC.
Think carefully about your kit. Binoculars can be handy, but they suggest to authorities that you might be up to no good. Don't wear military khaki, designer camo, or anything bright that prevents your blending in. And forget weapons. You are unlikely to shoot your way out of trouble, especially the trouble you face when armed dudes find you are packing.
On arriving in any distant place, the first thing you should do is learn the quickest way out—times and frequency of buses, trains, or planes. You have to know in advance how to leave.
Travel of Wisdom claude LÉVI-STRAUSS