Health is obviously first, you have nothing without it. But real joy is wanting to do something, something that is important to you, and being able to. Without desire there is no joy... just a slow countdown.
In general you get paid for doing stuff that no one one would do without pay, because it isn't fun. So work is less about having fun and more about what kind of suck you tend to be capable of sucking up.
I want and try to do stuff which is important to me and I know there will be problems along the way.