i find spending endless hours on this forum to be my idea of free time fun
but i also read a lot and find playing with audio to be a bit of fun. i like to strip soundtracks from movies and cut them up to use for other purposes. not really remixing as much as it is combining things from multiple sources to complement each other. often a song could use some nice quotes from a movie mixed in during the dead spots.
for instance i once found a copy of the beautiful people where someone had spliced in quotes from full metal jacket through out it. it worked perfectly and became a favorite among my army unit to get us worked up before a mission.
just one idea i like to use to help enjoy free time.