1. Make sure you have a signed, valid passport and visas, if required. Also, before you go, fill in the emergency information page of your passport!
2. Read the Consular Information Sheets (and Public Announcements or Travel Warnings, if applicable) for the countries you plan to visit.
3. Familiarize yourself with local laws and customs of the [...]
Protect Your Passport
Your passport is the most valuable document that you will carry abroad. It confirms your U.S. citizenship. Please guard it carefully. Do not use it as collateral for a loan or lend it to anyone. It is your best form of identification. You will need it when you pick up mail or check [...]
When you are in a foreign country, you are subject to its laws and are under its jurisdiction. You can be arrested overseas for actions that may be either legal or considered minor infractions in the United States. Familiarize yourself with legal expectations in the countries you will visit. Country Specific Information [...]
I travel to Thailand 3 or 4 times per year and having a cell phone with a local number saves me a lot of money. Local calls are dirt cheap and long distance calls back to America are inexpensive.
All you need is an unlocked GSM tri-band or quad-band phone a Thai SIM card. [...]
Currency
Local banks usually offer better rates of exchange than hotels, restaurants, or stores. Rates are often posted in windows. Above all, avoid private currency transactions. In some countries, you risk more than being swindled or stuck with counterfeit currency _ you risk arrest. Avoid the black market --- learn and obey the local currency laws, [...]
In the Case of Destitution
If you become destitute abroad, the U.S. consul can help you get in touch with your family, friends, bank, or employer and tell you how to arrange for them to send funds for you. These funds can sometimes be wired to you through the Department of State.
In the Case of Illness [...]
If you are ill or injured, contact the nearest U.S. embassy or consulate for a list of local physicians and medical facilities. If you request, consular officers will help you contact family or friends. If necessary, a consul can assist in the transfer of funds from family or friends in the United States. [...]