What's the point if you're not happy? Fulfilling your meaning and being utterly miserable seems like a goal I want to avoid. Unless meaning will lead to happiness, at which point happiness is again the goal.
I didn't mean to sound patronizing. "The pursuit of happiness." There is a reason it doesn't say happiness. Choosing your own happiness, yes that sounds like a pretty good goal to me. One of the original replies here does talk about choosing to be happy. Which is of course how you become happy when you have no outside influences to make you happy.
We have birthday parties and celebrations all the time. Why? Because life is miserable and we should take every opportunity to celebrate when we can.