From Mark Twain's Tom Sawyer, p.19:
"…..he would have now comprehended that work consists of whatever a body is obliged to do, and that play consists of whatever a body is not obliged to do."
From Better Than Before, p. 193:
"But it turns out that extrinsic motivation undermines intrinsic motivation, so rewards can turn enthusiastic participants into reluctant paid workers, and transform fun into drudge work."
Now think about those two quotes for a minute.
Also remember that what is fun for one person may not be fun for another, and the same is true about work.
Play is what we do because we enjoy doing it. Work is something that we perceive (and usually rightly so) we have to do. Play can become work if we are doing it for the wrong reasons, and this usually affects our attitude toward the activity in a negative way. Work can be perceived as play if our attitude toward the task at hand is a positive one.
Most of it is in our mind.
Before this all gets too confusing, just remember that whatever you are facing--play or work--thanksgiving produces joy. Find something to be thankful for. Enjoy your work, and enjoy your play, but in all things give thanks to God who makes it all possible.