A while back, someone (Alvin, was it you?) discussed the idea of spending just 5 minutes a day on the project. Not a bad thought.
Just go out and take care of some of those little things you mentioned--something that won't take very long, yet when you're done, you can see the progress. Also, there are times when you just need to sit out there and stare at it for a while.
Before you know it, things will start looking better, and not only that, YOU'LL start feeling better!
Good Luck!!