When we were in Vancouver, there were several people who had a problem that did not have passports. Had to do with Canadian Immigration. In Mexico, you need more than a Driver's license. I have always had a notarized statement that I took to Mexico before I had a passport. Now I always use my passport. It works the best... I also have a special holder/ safe "wallet"I got a the travel store that has straps that snap to your bra straps and then can be put thru the bottom band of the bra. It holds credit cards and a small bauble or two.