Some people spend a lifetime wondering how to improve upon that question and all they find is a garage full of stuff they had accumulated to gain meaningful purpose towards that goal. Pardon my saying this, but it's not as if they make garage-sized tombs anymore.
What I feel for meaning of life on this plane is exactly what brought this question up; the quest for knowledge.
Oddly, it goes in accordance with every religious and religion-lacking principle one could base as an answer for it in the first place.
For myself; I've needed to keep things simple. And I've been shown through trial and error countless times that usually the most simple explanation is most likely the right one.
-Lurch