[JoshTriplett]

Mostly, I'd never stop learning, and I'd apply everything I learned.

Consider the sum total of human knowledge today. Consider how small a fraction of it any one person knows.

Within the next month, I'll have completed a PhD in computer science. It took me years to learn the fundamentals of one field, plus years more to get practical experience by tinkering in numerous areas, plus years more to become an expert in one narrow area (scalable concurrent data structures) and advance the state of the art in that area. Take a look at http://matt.might.net/articles/phd-school-in-pictures/ to get a clearer picture of scale; now consider what a few million or billion lifetimes could produce, between research, practical work, exploration, and just good old-fashioned tinkering.

How many of those narrow areas exist in one field alone? How many more fields exist to explore? How many more will exist by that point? What happens when someone with expert-level knowledge in a pile of those fields starts applying them to each other? And most importantly, do you really think it ever stops?

Apart from that, I'd have plenty of time between learning everything and creating new things to enjoy the enormous amount of available entertainment created over the aeons, in all its various forms.

I think the future sounds awesome, and I want to see all of it. :)