Campers know this rule, but road trippers should follow it, too: always bring a roll of toilet paper.

It's good to have if you need to make an "emergency stop" if the next exit is too far away. It saves you problems at poorly stocked rest stops. Finally, it's great for cleaning up those spills of giant sodas and coffees from a little road turbulence or heavy-duty laughter.

The meal was delicious, and the atmosphere was divine, but then it comes time for the bill. As long as you know numbers in the native tongue, dealing with the bill should be no problemo. Perhaps you know your basic, uno, dos, tres... but try learn more numbers in the native tongue.

Parts of Italy are especially notorious for using some fast-talking to try and overcharge for even your basic bowl of penne. Make sure you have no problem asking for correct change or asserting that your meal was trece (13) euros -- not treinta (30).

Pro tip: When you arrive in-country, look carefully at the money from that place. Learn what the different colors or sizes of the bills indicate. Later, when you're feeling rushed -- perhaps you've been drinking? -- you want to feel comfortable with the cash and not throw down the equivalent of $100 when all you ordered was two beers.