One of the best practice I experienced trying to come to terms with depression and apathy in PD, is having a positive attitude. Last year I posted about the importance of making lovely activities, so in my case it is to keep on flying. All around a private flight there are lot of stuff you need to know, to evaluate, and finally... to enjoy. Such things work like a natural engine for my mind and mood. I'm so glad and excited any time I take off the ground that PD loosens its bite at least for a while.
Even if you don't fly, there are so many beautiful things to do that will stimulate our positive emotions and therefore also improve our quality of life.
Many friends have told me that in this video (flight from Rome to Croatia) I am smiling while I usually have a flat expression. I am attaching the link to encourage you to do beautiful things, even simple ones that you like a lot:
Luca