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.