STAY IN AND DO NOTHING
There is nothing more peaceful than have a free day of hard work and just lay in bed all day doing nothing. Not caring if the world is ending because you have all the time in the world. when you are in a relationship, most of the time you are either on the phone or out with your partner, and that is great too. but when you have less responsibility you start to think of what other things are out there that you could be doing or in my case just laying out on the couch and flipping through channels on even sat relax reading the book you have been procrastinating so much to read. and even maybe try a new hobby.
PS. There is never a chance to lose, try to just relax once in a while as often as you can.