Always make 2 sets of copies of your passport, airline tickets, travlers cheques, insurance papers and credit cards, keep one safley away from the original and keep one set at home with a friend or family member. It is much easier to get replacments when you have the copies.
Also make sure any perscriptions you must take are full, you do not want to be over charged when trying to fill them over seas, and have a Dr. note say that you really need to take those drugs, you do not need any problems @ customs in a forien country.