When you die, how old will you want to be, what will you want to have acheived in your life, and in what circumstances would you want to die?
Ideally, through the wonders of nanotechnology, I'd like to die around the time the universe does (heat death or whatever). I'd like to think that, within many billions of years, I'd have ample time to achieve not only everything I want, but pretty much everything possible. Seriously, I intend on outlasting every single living there there is or ever will be. My mission will be fueled by the power of pure bastardry - more efficient and far cleaner than nuclear power.