Ten: Disconnect

Leave the cell phone and laptop off. You're on vacation, not at work or at home. By all means, bring them. They're good for long periods of transportation on a plane, train or bus, but are otherwise unnecessary. There are better things to do wherever you are than talking to your friends back home, reading the news or surfing the web. You can do that all you want when you're home in a few weeks.

Nine: Space

Always leave some extra room in your pack or suitcase. No matter how hard you try, you'll always end up coming home with more than you brought with you in the first place. It's good to be able to carry it with you because it's very expensive to mail things home.