Modern amenities have taken many of the risks out of travel. We're no longer waylaid by highwaymen, and we don't risk death by exposure just because we want to visit Aunt Millie up the road. But travelers still benefit from the use of safety precautions; some sensible steps can help you be more aware of your surroundings and lessen the risk of theft or worse during your travels. These tips are particularly pertinent when traveling in developing countries, where criminals may target Western tourists.
Generally speaking, refrain from packing any valuables you don't absolutely need on a trip. Leave expensive clothes or jewelry at home, and bring computers and iPhones only if they're necessary to conduct your business while away from home. Secure any valuables in a hotel safe or in your luggage, and don't leave your bags unattended. Use traveler's checks instead of cash, and carry valuable documents like a passport or visa in a secure location. Try to divide your traveler's checks or valuables among several places on your person, rather than keeping them in a single pocket or wallet. Belt pouches that you wear under your clothes make an excellent place to store valuable documents, because they're much harder to reach than outside pockets.
Traveling safely means being aware of your surroundings and steering clear of trouble. When walking on the streets, stick to main thoroughfares that are well lit and full of people. Stay away from places where there may be a police presence, such as public demonstrations or high crime areas. Don't travel alone if you can help it, and don't draw attention to yourself by dressing in a flashy or overtly conspicuous manner. Move with purpose, even if you're lost, and don't discuss your plans or itinerary with anyone you don't know.
Make sure someone at home has a detailed copy of your itinerary before you travel. That includes specific information like hotels and phone numbers for each of your destinations. Check in regularly with your contact at home (once a day or so) so they know where you are. On a larger scale, you can register your trip with the State Department at https://travelregistration.state.gov. That way, you can be reached in the event of an emergency back home. Take time to familiarize yourself with the numbers of local police and fire departments wherever you're traveling, and know the procedure for using a pay phone if you need to call for help. Remember, when you're in a foreign country, their laws apply to you. Understand what those laws are and know the location of the nearest American consulate in case you need assistance.