If a universal basic income started today with the stipulation that you had to put 40 hrs/wk towards making the world a better place or solving societal problems, how would you spend your time?
I think I'd take a few years and destroy all the "grass" lawns in the country, replacing them with native plants that don't need manual watering or chemical fertilizers and pesticides. Then I'd destroy a lot of vehicle infrastructure and replace it with high-speed train, bike, and pedestrian infrastructure. Then I'd probably just jerk off and go to concerts for the rest of my life.
Once the work is done, it's time to party! Seriously though. With 40 hours and no fatigue from corporate drudgery, I bet you could go far. I want to be more involved in bike/transit advocacy in my city, but many of the meetings are during work, or during the hour I need to unwind afterwards.