I think it depends on the person. I find reading - as in, an actual book, not stuff online - to be the most taxing. I can barely do more than a page.

TV and Internet used to be the worst for me, but now I can handle them. I have found that closing my eyes during commercial breaks helps. If I forget to do that, I end up in a lot of pain.

Candy Crush used to make me feel terrible and cause an excruciating headache, but for the past week or so, I have found it very relaxing.