Nada
I'd do nothing.
I'd do all my usual hobbies all day long, maybe workout and cook more often, visit friends and family more often, and meditate like I know I should but never do.
I'd take up star gazing maybe - after moving away from the employer-driven cities with their congestion and noise and industry and live in a nice quiet cabin.
I might try gardening. I dunno. Maybe I'd just make friends with a gardener and figure out some other way to barter for a share of their vegetables, like hunt down killer bugs or tend bees.
I'd read every bloody day - not just little bits here and there, but like a whole work of fiction every afternoon and evening.
I'd volunteer my time to whatever community group fit my groove, and I'd do that at least three times a week - including those precious weekends because everyday would be a weekend for me.
I'd sing and learn to dance, maybe invest in an actual karaoke machine and host sing-a-long's at my cabin where nobody can hear you but the birds (who are horribly offended at your feeble attempts).
I'd just live, not defined by my productivity or my efficiency or my ability to produce some kind of good or service for others. Just by my changing interests and random flights of fancy. By my creative urges and inner curiosity. By my carefully tended network of friends and acquaintances.
And gosh does that sound awesome.
Maybe I'll just do it now - I've got a few hours to kill after work today.
Why not.