Be careful with the US passport mate...when lost the new one has a new number and the old one is flagged/canceled...could get you in a mess using it.

In addition...the International Driver's License you speak of isn't stand alone...it requires a legal and current license from a country to be valid..it is basically just a cheap, paper booklet, multi-language translation of your country/state issued license with a passport sized photo stapled inside...alone it is worthless and looks like it was made in someone's basement with a bad printer. It should also only cost 5 or 10 usd maximum...any website selling them for more or fancier versions are illegitimate and just scamming people.