This might sound weird, but one of my favorite things to do when I get really stressed out is look at the AAA Road Atlas and plan routes for potential road trips. It doesn't even matter if I never take them, but somehow picking a weird destination, figuring out how I'd get there and what I'd do along the way is greatly distracting and oddly relaxing. Otherwise:
--Eating copious amounts of Rocky Road ice cream
--Looking at this David Hockney painting (swimming pool, diving board, etc.) I have hanging on my wall
--Reading essays by EB White and Roald Dahl
--Calling my mom to listen to her prattle on about her day. She's happy I'm calling her and I like the details of her small-town intrigues, so it's a win-win situation.