It's really hard to answer a question like that because I think it is more of a lifestyle than one or two secrets that can be shared, IYKWIM.
We've chosen to make home (including farm) and family the priorities, so everything gets filter through that. We don't leave very often because I found that it was stressful and hectic to try to run a home (farm) and not actually be home. I do most of my shopping online, even.
Activities we do, we do as a family most often. That keeps us all together, and allows us to do more because all of us are working on the same stuff. Speaking of, we all work together. It is amazing how fast the two oldest children and myself can weed the garden! While we do that, the two youngers flit around being go-fers, or helping Dave do something else. We can get an amazing amount of work done in an hour.
Another thing for me is the multitasking, and filling in time holes productively. I knit while listening to new readers work their way through another day of phonics. In between students, I throw laundry in. I'll answer mails when there is a moment of pause. Right now, one of my clean up projects is cleaning and rearranging the pantry. I've been working on it in the times when there isn't anything else (like while I'm waiting for dinner to cook). I've been working for about a week on it, and it might take another week, but slow and steady it gets done, whereas if I waited until I had time, it would never get done, or be such a huge job that that would be all I would get done for a day.
And we sleep very well at night!