Adulthood is mostly about getting things done. Past a certain age, our existence is consumed by obligation. So one of the first things to die in adults in playfulness.
Remember how much fun you had playing children's board games? This week take time to play. Even if it's just for an hour or half hour. Start slow. Find a park swing or read a fun magazine, or treat yourself to ice cream, or some other forbidden treat you haven't had since childhood.
Just do something for no purpose except to enjoy, spending time producing nothing but adrenaline, laughter and memories.