1.) When you wake up in the morning, it is to do something fun, rather than deal with a difficult situation or person at work or tackle an unpleasant chore. On vacation, if there isn’t something enjoyable to do, you can generally go back to sleep until there is.
2.) Vacation often involves spending time with family or friends you like, either because you are visiting them or brought them with you.
3.) It is a great excuse to do things that are special and possibly expensive; it’s okay, we’re on vacation.
4.) Sometimes you get to wear out-of-season clothes. Not only does this shake things up, it also increases the time between which one needs to do laundry. (Unless undergarments are your limiting factor, in that case it just livens things up.)
5.) It’s vacation. It’s full of special treats and plans.