ALWAYS travel internationally (including from Canada to the US) with a passport and a drivers license -- as well as any other photo i.d.s you might have.
Before you travel internationally, make a copy of the front pages of your passport (with your picture) on the same page as a copy of your driver's license AND a copy of both sides of your health insurance card AND a copy of all of your medical prescriptions. Make one for anyone traveling with you (if one is held up, all are held up).
Put one of these copies in every single suitcase, backpack, carry-on, purse, etc. that you are carrying with you.
Prepare a detailed travel agenda, including plane flight info, hotel info, train info, etc., including departure and arrival times. Put one of these in your suitcases, etc. with your identification verification pages. Leave a copy of this at home with at least two people.
Keep the receipt for reservations of any kind -- flight, hotel, train, etc. and don't keep them with the actual tickets. If the worst should happen, it is much easier to straighten all your reservations out if you have those receipts.
I've never had any problems traveling. But the possibility is always there, particularly when you travel by yourself (as I tend to do a lot -- it must be the "band thing") and it never hurts to be prepared.
If you were to lose your identity in a foreign company, it is a great deal easier to re-claim it if you show up at an embassy or police stations with a page such as I've described above -- which includes all of the document numbers the authorities would need -- not to mention pictures of you as yourself.
Make sure you explore the restrictions of the countries to which you are traveling -- Australia, for example, requires a VISA for entry (a travel visa, not a credit card) which can be purchased online and is good for 2 years. When you are planning a vacation outside your comfort zone, your computer is your best friend.
The train from Paris to Avignon is quite delightful! As is the train from San Diego to Los Angeles. Don't forget to include trains in your travel scheme!
I'm always available for travel advice.
Carol
I'D RATHER REGRET THE THINGS I'VE DONE THAN THE THINGS I DIDN'T DO!