To me, the zone is any situation that makes the baseline pain of being alive go away (there's too much to unpack here, so I won't).
Things that can bring me in the zone:
* Riding my Honda CB750F, especially without a destination, just moving through the world in this raw, old-fashioned way liberates my mind and puts me at such ease.
* Coding something I like.. Again it's not entirely the destination that matters, it's the journey, the work itself that changes my focus from the mundane to the creative.
* Listening to great music while doing almost anything, including not doing anything.
* Watching a movie or tv show with my wife or a friend.
* Creating something, art or invention or utilitarian object, changing my environment to suit me.
* Unstructured time to myself with no immediate tasks that has to be done, so that I can entirely let go of any thought and just drift, having no plans whatsoever.. This is probably my favourite thing in the world, but also most difficult for me to achieve..