Alan Watts quotes are easy to come by. They practically fall out of his books and lectures ready to share out of context.
This quote is different;
This is the real secret of life — to be completely engaged with what you are doing in the here and now. And instead of calling it work, realize it is play.Alan Watts
Many Buddhist and Taoist teachers have uttered similar lines. Watts makes it nice and easy to understand. Westernized. Sans mysticism.
To work until the task takes on the nature of play. A simple thing at first glance . . .