Keep the copy in a location separate from the documents. If possible, carry any required prescriptions in the original containers. Consider carrying them on the plane instead of leaving them in your checked bags. Carry a list of blood type, allergies, or any special medical conditions. Medical alert bracelets are a good idea.
Hand carry any sensitive or proprietary information.
Leave all expensive and unneeded personal or professional property at home. Check with your medical insurance carrier about coverage away from your home and work. Avoid a demanding schedule upon your arrival if you have traveled across many time zones. Give yourself a chance to adjust to new surroundings. Consider leaving them at home.