What happens after death is a metaphysical concept (in terms of what happens to the human identity, not the body). In this sense, you're dealing with limited knowlegde and no direct psychical evidence, only human logic and intuition, and depending in what you believe in, supernatural revelation.
I know physically I will return to the earth and the circle of life will continue on.
Spiritually I will give an account of my life in the presence of God, as according to my beliefs as a Christian.
So here are my beliefs regarding the afterlife;
I believe that human beings have eternal souls (since eternity nor infinity exists in nature, this is again is a metaphysical statement).
I have faith in Christ that he was telling the truth, that there is good historical reasons to believe in not only his existence but also in his death and resurrection, and that there are good logical and reasonable grounds to believe in the existence of a personal and divine, supernatural being whom we call God.
I would love to go to heaven, but whether I go there or not, I'll have to see. On this I'm going by faith.
I know Hell is not a politically correct view, but yes I am a hell believing Christian (no point denying it).
Hell to me is a place of madness where one indulges in their own twisted desires and delusions, resulting in the their own suffering. The evil within that individual is turned against them, and in that they will face their reality. I don't view Hell as a place where God directly punishes people, but rather as a place where God gives the individual over to themselves for eternity, and in spite the individual suffering will blame God for their own decision to be apart from God. Humans are not stable beings, not even on earth, not emotionally nor logically, I can only imagine how magnified that condition will be in place like Hell. The Hell that is spoken about by Jesus is metaphorical interpretation of this. Its not a nice place by the sounds of things. Hell on earth is bad enough.
As far as Heaven is concerned, it is the place of God. The only ones that are in Heaven are those that desire to be with God, accept God for who God is, humble themselves, place nothing above or equal to God and are willing to submit under his grace. The joy of Heaven is being in the presence of God, for me it would be an honor to be with God without the problems of the world on my shoulders. What I go through here on earth will be miniscule in comparison to the concept of eternal life, whichever way the scales tip. For some of those alive, earth will be either the closest thing to hell or heaven that they will experience.
Whatever you believe in, I believe that humans should strive to make the most of what they have here already, for all we know, this might be it.