The concept of this mission is deceptively simple, yet not necessarily easy to implement. You have to work in work time - focused on what you want to achieve, no procrastination. But you also have to make sure you do your best not to allow for work to spill into play time. And that you use your play time well.
Of course this doesn't mean that you should be going out there doing mad stuff - though feel free to do so if that is what you truly want. But you need to do things that you truly enjoy in your free time. Keep focusing and being serious about play time too.
Work without procrastinating in your work time, and don't let others push your play time around just because you have actually finished your work and they feel you should keep on being busy. Enjoy the benefits of being truly off work: when you are having a nice relaxing or exciting evening, other people that where reading and chatting about the news for two hours at work will have to work during their evenings.