This is what I do:
1. Magpahangin which means get some fresh air. But since we usually have haze in Singapore what it means to me is to run to the nearest Toastbox to get a glass of iced teh c (iced milk tea).
2. Window shopping or go to the grocery. Nothing like getting distracted by retail therapy (this is why I have a weekly allowance to buy 3-5 items at Daiso).
3. TFC/DVD! If reality is a bit of a mess, it helps to get lost in another world and watch other characters get more stressed (it's usually worse than what you are going through anyway).
4. Color your world. I got several coloring books on my last birthday. Or you can bake colorful cake! They're a good stress buster.