Funny how that feeling just comes over you when you're not trying, isn't it? Just can't talk yourself into that state.
We seem to have a lot of contented gardeners here.

And fire watchers, drawers & painters, people watchers, nature lovers ....
Writing used to do that for me, too ..... You know long, off the cuff pieces that really involve you. Once I spent ages on the computer typing everything I could recall about my mother, which led to my sister, my aunt, primary school, on & on ..... Very engrossing.