For a lot of them, for example, they'll see this as their chance to switch from feigning interest in Achievement-based work, to genuinely striving at Explorational work: likely in the form of making (and perhaps trying to sell) artistic works all day, or doing original mathematical/scientific/philosophical research.
I imagine that you'll see a sudden glut of Great American Novels, itch-scratching open-source software, and enough treatise to compare to Venice in the 1600s, but relatively few dishwashers. :)
We might also see a resurgence in Social work: people who can now afford to spend all day doing volunteer work for various causes. I'm unsure as to the impact of this, but it would probably be a minor revolution and solve several "just needs more bodies" welfare problems (like getting everyone immunized for things, or having an appropriate number of daycares/preschools.)
Besides, even Great American Novelists have use for money. They could buy equipment for a roadtrip, buy a nicer computer for writing, buy services that help them focus on more writing (e.g. pay other people to be dishwashers), and so on. In turn, this gives them incentive to work. It's capitalism as usual, it just doesn't fetishize the 40 hour workweek.
EDIT: just saw you added social work to your list. You're beating me at my own game, perhaps I'd better stop preaching to the choir?
How do we make BI happen?
"About four labor credits are required per day, which translates to anywhere from two to six hours of work depending on the number of credits that are awarded per hour for a given job. Unpleasant jobs, like cleaning sewers, are given higher credit values than easy ones. Members are free to choose their jobs each day, except those that require special training, like medicine."
I recommend that book. (I read it when I was a teenager, more than twenty years ago.)
Perhaps not, but so long as the market can offer something to everyone people will still have incentive to work. Basic Income doesn't mean you can afford everything without working.
The market is extraordinarily good at producing carrots yet we seem hell-bent on using sticks. I think there's room to improve on that front.