I think people have different definitions of "play."

[ What the Krogan consider play, Shepard's pretty sure the rest of the galaxy would consider to be destruction of public property. Some people would consider jumping off a building in an elf costume 'play' too... ]

Is there anything you do just for yourself, because you enjoy it?

[ Admittedly, this is pretty hypocritical coming from him, given that he doesn't really have 'hobbies' either. But hey, he knows how to have fun. ]