With a guaranteed salary of $300k/yr and unlimited free time I could do whatever the fuck I want. I'd plant a garden, brew beer, work on fun home/shop automation projects, build cool car stuff. All while being paid handsomely to do so. And I'd travel, go sailing, go hiking, go snowboarding. But I have no delusions of grandeur about "getting humans to Mars" or whatever, that shit sounds stressful, and like a waste of life.