Immortality.
By the time you're the last one left, which, in my assumption we haven't nuked ourselves to oblivion and manage to live at least a couple thousand years, we'd have the technology for AI's pretty damn good by then, so you'd never truly be alone.
Plus eternal lovebots and virtual reality, I mean, come on. Kinda ties in with my first point, so at least you won't be bored.
Also plus, cloning will probably be perfected by then so you won't truly be the last one left, assuming you have the knowledge to operate the machinery.
But that's only scenario one.
If you're immortal and humanity dies off in the next hundred or so years, you're going to have much less options, but there's still plenty to do.
I mean, free food, right?
Assuming scenario two is the one to come to pass, being immortal would probably hit a drag after a while though, because life would lose all predictability unless you know how to start fixing humanity being dead and all.
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