What does it mean to be a rock? A planet? A star? A wild animal? The wind or a tree? The meaning of each 'thing' lies in what it is, the way it exists. The meaning of a star is just that -- being a star. In this context, the meaning of life is exactly that -- being alive.
There is an effortlessness that you can witness in nature. Grass does not try to figure out it's purpose, it just is, it doesn't try to grow, it just does. Fish donít try to figure out the stream or it's reason for being a fish, it just swims. Flowers donít question a thing, they just bloom. Nature knows it's meaning in the life process without questioning it, or perhaps it doesn't, yet somehow it fulfills it's purpose anyway, simply by being what it is.
The question then is simply, what makes you feel more alive?