Here's my thoughts on this. Since I don't want to consider the circumstances of my possible demise (until proved otherwise I'm telling myself I'm immortal - It's a pretty cool game since if you turn out to be wrong you'll never even know about it - unless there is life after death in which case I would know but technically I'd still be alive and thus actually still correct in my thesis)
The truth is I think about living a lot more than dying - so my list goes like this.
I don't want to die having been unsuccessful.
I don't want to die not having mattered or made this world a better place.
I don't want to die without having pushed the limits of everything I can do. Not all the time mind you but when its called for.
I don't want to die with dreams I never attempted to fulfill.
I don't want to die thinking I should have had more fun.
I don't want to die fearing anything.
I don't want to die regretting anything.
I don't want to die thinking I could have done better at the things that matter.
I don't want to die for a very long time.
Basically, I want to live as long as I can and as much as I can. And if that moment ever comes, be satisfied with what I've done.