Let's say that one day, God comes down and says to you, "Look, I like you, so I'm going to give you a free pass to Heaven. You can do whatever you want, and you'll never be punished for it. Not in this life, not after you die. No matter what you do, you are guaranteed to get into Heaven." And he also proves to you beyond any doubt that he is God. So for the purposes of this thread, take it that it is actually God who is giving you this, not Satan in disguise or anything.
So, if you were given this assurance by God, would you go out and become a killer, thief, rapist, etc?
If we're taking the existence of God, Heaven and Hell for granted, and I really can do whatever I want, I know what I'd do: destroy Hell. Destroy it in a way that God could never rebuild it.