While traveling outside US, documentation is an important part of your trip. Outside US and even in other States, you and your luggage are recognized by your documents. Carrying proper travel related documents and identity proofs could help you avoid unnecessary jitters.
The best international travel tips is to carry original copy of some documents and keep one or two photocopies of the other in case of emergency. You should also leave a copy of your documents with some friends, which they can fax to you if you loose yours. Ask your travel agent or friends who have gone to those destinations about the necessary travel tips for documents.