Dear Professor Dawkins
I have just finished watching your show "Sex, Death and the Meaning of Life" in which you mention that you are frequently asked the questions: "Why do you get up in the morning? How is there meaning to your life if you don't believe in God?"
It occurred to me that an answer to these questions could best be posed with two questions of your own. Namely: "Do you ever ride roller coasters or water slides?" then "Why, you know they're going to end, so why bother?"
The obvious point being that it is the ride itself that is its own justification. That it is in the living of the life - or the enjoyment of the ride - that you find purpose, meaning, accomplishment, joy, enlightenment, things that makes it so very worthwhile to get up every morning.
Knowing that the ride will end, knowing that there is no mystical eternal revelation in the pool at the end does not stop us from climbing the ladder to the top of the water slide and enjoying the rush on the way down.