A minister somewhere told me that when his friend was feeling down, he would buy a pack of socks. Now, for the next six to eight days, on average, he would have something very small yet special to look forward to. A pack of socks do not cost very much, but they are new... they are clean (especially if you are like me where my socks tend to be white only once)... they are special, but only for him.
On my off days, I make myself a warm beverage. I generally read. I might surf the internet. However, I try to do things that are special to make an un-special day worthy.
Interestingly enough, I consider humanity's relationship with Christ in the same way. Ordinary people living ordinary lives become extraordinary because of their interaction with the Divine. Ordinary days become extraordinary because of eternal love.
So the next time I have an off day, I intend on making a cup of tea and reading from my novel... but I will also reflect on what makes life beautiful, and just how dull every day could have been without it.