For me a mental health day means staying AWAY from a computer. Problem is, we have smart phones now so we literally take our computers everywhere with us. And I cannot be completely cut-off from life so I bring my phone and the challenge becomes not to look at it every ten minutes. LOL
Go to the movies, take a walk in the park, take a day trip somewhere, go for a long drive, go shopping at a mall or (better yet) flea market or fair. Just get OUT and AWAY from all these damn SCREENS and you will feel better.
