Happiness is complex. Some see it as a feeling that is experienced moment to moment and others understand it to be only realized when engaged in something meaningful. One kind of happiness you experience more often while the other, the meaning-based experience of happiness is less persistent. The question is then which do you want to maximize?
Put another way by Cornell psychologist Tom Gilovich, “Should you value moment-to-moment happiness more than retrospective evaluations of your life?” Interestingly, he's also the psychologist that discovered that people regret more the things they haven’t done than things they have.
What do you think?