Read the Travel Advisory and Alerts for the countries you will be visiting at travel.state.gov/destination. Review entry/exit requirements, visas, local laws, customs, medical care, road safety, etc. Write down contact details for the nearest U.S. embassy or consulate to carry with you in case of emergency while traveling.
Before going abroad, notify your bank and credit card companies of your travel, and check exchange rates. For information about using cash, debit/credit cards, and ATMs overseas, read information about your destination.
Make two copies of all your travel documents in case of emergency. Leave one copy with a trusted friend or relative at home and carry the other separately from your original documents. To help prevent theft, do not carry your passport in your back pocket, and keep it separate from your money.