For what it's worth....
I don't think there is any meaning in the simplistic sense (ie 42 or something like that) but I do believe that the way you live your life is vitally important. If you murder, rape, steal, always strive to just get stuff for yourself, to exploit others for your own ends etc, you condemn yourself to being a certain kind of person and having a certain kind of very limited life. If however you strive to be good, to do what is right, to love and respect those who deserve love and respect, to behave unselfishly and to look into the mystery and beauty of this world then you will have a much more rewarding and fulfilling life.
I don't believe in heaven and hell, and for me, not believing in these things means that this life is all the more important - it's vital to get things right because you will never get another chance. But I do believe that exploitative or sadistic people create their own ****** realities, and compassionate people create their own beautiful worlds - in effect, we create heaven and hell in our own lives.