Depends on the level of stress.
Play games, watch movies with a glass of whisk(e)y.
Go out and drive on the freeway/highway or just around the city. Helps me clear my thoughts and take a look at the bigger picture.
Go out with friends - to a bar or in the woods.
Play with my son.
Take up some kind of DIY project.
Sharpening the kitchen knives always helps.
To sum it up - just try to distance myself from the issues that are causing the stress and get some prespective.