Relax

The idea behind a vacation is that it's a time for you to relax, and get away from the daily pressures of work. And that would make sense, were going on vacation not incredibly stressful. 

Not only do you have to arrange all the things which are normally handled by your established patterns: food, lodging, transportation, etc-you also have to manage all the little stuff that you can normally put off, like laundry and dirty dishes.

Oh, and you have to do all this with a deadline. And coordinate it with anyone who's going with you. And prepare for any rain/traffic/other delays that might occur. Also you didn't clean out the cooler last time you used it, so now you've got to go rinse it with bleach. Don't forget anything.* Who's feeding the cats, again?

*If you forget your phone charger, you've remembered a paperweight.