What do you do in WoW "just for fun"?

Not for rewards, not for someone else, I'm curious what other players do in-game only because it pleases them and not for any other reason or reward.

These days, once my "raiding" and dailies are done, I've just been chaining casual WSG over and over and having a blast, although I'm not really getting anything for it (other than paltry honor or prestige ticks).