In the words of Aristotle, "The best activities in life are the most useless.....this is because such things are not subordinate to a further end, rather done for their own sake" These goods (activities) are excellent in themselves as opposed to an activity that is in service of something beyond them"
In my experience this holds so true......the most enjoyed and memorable moments are never the means to another end. They are joyful because they are simply joyful, and not "getting something accomplished" Even in prayer. When we pray, we are uniting with and loving our Lord. It is not an activity that is accomplishing a chore off of our list of things to do. There is nothing physically to show for it when you are done. It is just wonderful, valuable, and joyful in and of itself.