I'd like to live for a time, sure, but even five hundred years might be too long. I'd either get driven insane by the constant bow-shocks of ever advancing culture, or I'd lapse into some kind of boredom-induced stupor.
I have my little slice of spacetime, to do with as I wish. I could live a great and noble life, or a horrific and cruel one. I could live another five decades, or if I wanted to, end it all tomorrow.
No matter what I may do, or not do, in the end.. there are no regrets, no looking back. Just.. the steady decay of my body, the essential atoms of my makeup being reused by other organisms, processes, chemical reactions.
And I like it that way.