8. Bring a dummy credit card
We now save the fake credit cards that banks send out in their promotions. Hotels that use key cards often require that you park them in a slot to turn on the lights and air conditioning. Thats great, except that it means that the already feeble air conditioning shuts off when you leave the room. A fake credit card in the slot not only keeps some cool air pumping, it also keeps the power on so you can recharge your iPod batteries.