Go skating! Go snow skiing! Especially snow skiing.
When I take a day to go to the slopes my mind completely escapes from everything else. It's me on the mountain, concentrating only on the wind, the snow, and where I am going.
After a day of that I can go back to work and relationships and feel like I've a month off!
Too bad - I've got a sprained wrist right now and am missing some great skiing conditions!