I've recently realized how great my life could have been if I'd just been more perceptive and less paranoid around people, so my personal idea of heaven is getting a do-over on this current life so I could get it right.
Conversely, my personal hell would have to be getting a do-over and screwing up worse, and repeating this on through infinity without ever getting it right; or even worse: finally getting it right, but having that lifetime erased with yet another lousy do-over.
Kind of like that Twilight Zone where a murdering crook gets shot after an armed robbery, goes to what he thinks is heaven because he's given whatever he wanted in life, but he immediately gets bored with it and is stuck with it forever and realizes it's hell.
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No one in the world ever gets what they want,
and that is beautiful.
Everybody dies frustrated and sad,
and that is beautiful.
-TMBG