Plants and lichens, as far as we know, do not meet this criterion. I eat to stop the pain in my gut. I only go to the bathroom when I feel the pain of excrement waiting to exit. I don't try to defecate because it feels good. I would say that the pleasure one gets from eating and defecating is simply the feeling of relieving pain.
Pleasure is just a nice additional benefit.
My point is that hedonism requires life, and so living is a more basic drive than hedonism. Living is not only more fundamental than hedonism, I think, but it's an end unto itself. This is similar, I think, to happiness in the Nicomachean Ethics. Now you are just being silly. I'm actually more content while driving when there IS no other purpose.