I think one of the most ridiculous things we do is ask questions like this. It's just so anthropocentric. The centipede and the tree don't ask what the meaning of life is. That being said, I love the discussion.
I think our job is to exist, evolve, and most importantly, obey the laws of nature. Every other species does, but somehow we think we are special and can reproduce indefinitely and manipulate our environment to an infinite extent. All creatures affect their environment, but not like we do. We are destroying the biodiversity of this planet while we continue to devolve. *Getting off soapbox.*
One of the most important things I think we can all do is stop defining good and bad. We are so preoccupied with this inane activity, and hell, I do it too sometimes. But recently, when my grandma died, people expressed to me that they were sorry and how it was so "awful." I wasn't sure how to take it. I'll miss her, but she was 92 years old and suffering from late stage dementia. It wasn't GOOD, but neither can I say it was really bad. It just...is. Take a traffic jam as another example. If you sit there and think about how "bad" it is, you will miss seeing it for what it truly is and also miss the opportunity for either introspection, conversation, listening to music, or a million other things. There are so many things in life that we could take so much advantage of if we weren't so caught up in how abstractly good or bad they were. They are.