The way it was explained to me, its UNnecessary work, some work is necessary, in fact isn't there a story in the Bible about something about an animal falling into a pit, and discussion about working to get it out.
When you have a job, and it becomes necessary to hold that job working on a Sunday, I believe God considers it necessary. Cooking is necessary, nursing is necessary, keeping things running in the world is necessary.
All of you who go to the poor grandmothers house on Sunday, did you ever think how hard she is working?
Our priest do not agree with doing gardening on Sunday, even if it for enjoyment. I believe the reason was scandal.
Recreation is okay. However if those who feel it is so wrong to eat out on Sunday, probably would feel it wrong also to play golf, go bowling or even to a good movie, or play, if you can find one, because by going, you might be causing someone else to work. Even getting gas, might be causing the gas station attendent to work.