It's also probably useful to note that this kind of freedom seems to bring happiness even if one doesn't actually use it for anything particularly interesting, which is not so obvious when one is in a position of not having it.

Just being able to consider pants entirely optional and ice cream with bacon on it to be dinner and 4am to be an entirely reasonable bedtime (or 6pm a reasonable bedtime and dinner optional and your favorite tea as an anytime drink, or whatever) is enough, in other words. You don't actually have to go skydiving or build the next Google on top of that - unless you want to, of course.