Everyone has dreams and aspirations. No matter who you are, we have all wanted to accomplish or accumulate something. Although we all have dreams, we can experience hardships, setbacks, and fears that deter us from pursuing what we want. What if you had one chance to do anything and were guaranteed not to fail?

coming true I'll be the first fool to try flying.

 
Given your very broad options I would have everyone in the world holding USA federal debt transfer ownership of that debt to my account. From there I would set about slowly converting as much as I could into more productive investments.

 
From there I suspect there is very little else I would not be able to do.