It's ok to do nothing.
I tend to forget this over time in daily life. Because I'm busy all day at work I somehow think that my life is not meaningful if I'm not also busy all the time after work. I try to be 'productive', to make the most efficient use of my time. But sometimes the best thing you can do with your time is nothing. It clears your mind, it puts things into perspective. It makes you happier as a person. The happiest person on earth is not the person who has everything, it's the person who wants nothing.