Aside from:

1) sex
2) walking behind my bird dog
3) archery (lots of zen-like stuff going on with this)
4) listening to music
5) reading
6) slow cooking on the BBQ (with a cold beer, of course)
7) fishin'

I find that cleaning up little chores is a great stress reliever. When you get all the little pestering things behind you, it's a lot easier to deal with the big stressers. So get out there and make a list. The list is important as checking things off as you go is highly theraputic. The list should be all the things you need to, but don't really want to do. Make the phone call you dread, clean the garage, write the thank you note that's overdue, floss the cat's teeth..... only you know what should be done! I promise you that you'll feel very relieved by taking care of a bunch of 10 minute projects.