As for Eden, I once heard a sermon summarize Eden as a place that we would only enjoy until we decided there was some place better, whether that place existed or not. Ignorance was the reason Adam and Eve stayed and once they ate from the tree of knowledge...
If I remember the story correctly, the tree with the apple and talking snakes was referred to (as you sadi) the tree of knowledge (of good and evil). When we starting judging, we lost paradise.
Ignorance leads to suffering, not bliss.
How's that fit? LOL