Atheism doesn't presuppose either hedonism or nihilism. This is a common theist libel which is surprisingly popular on this forum of ersatz rational thinkers and logicians. Atheists are perfectly capable of finding value and meaning in their own lives and the world around them, they just don't base that value on a belief in the supernatural. Listen to any astrophysicist, physicist or biologist talk about their field and you'll encounter a wonder and awe that no theologian reciting thousand year old tracts can match.
You're welcome. I'm glad I was able to clarify it.
It's not the first time I've made such a clarification - it's a very human impulse to defend your belief system from unjust attacks that aren't actually there.