Art and creative endeavor have always been central in my life. The onset of Parkinson's has made that creativity even more important. It's ironic, but knowing what Parkinson's may eventually do to you can vividly sharpen your focus, help separate the trivial from the important, and enrich your work.
I have also found that continually striving to solve the creative problems (that constitute the bulk of artistic enterprise) is a very effective way to fight the inevitable fatigue and depression of PD. That internal creative struggle keeps the soul alive, even if the flesh decays.