The benefits of having a good attitude are getting things done, wanting to make friends, and being helpful. I think getting things done is one because you wont be a slacker and think about the negative you will lose energy and will move slow.
I think you would want to make friends because you are in such a good mood you want to be nice and positive. I think you will be a helper because you have the positive attitude to help out and do good.
Remember to always be positive and make the right decisions to stay positive with a good attitude.