Question: Creation of Mankind

Here's a good one to ponder...

If God knows all things, even the future, then He can never be surprised by our actions. So God was not surprised at Adam and Eve in the Garden of Eden when they disobeyed Him and ate from the tree of the Knowledge of Good and Evil, thus throwing Creation for a loop and breaking mankind's relationship with God. Luckily for us, God had a plan of restoring that relationship through the acts of Jesus as seen in the New Testament.

But if God wasn't surprised at the sin of Adam and Eve, and actually knew it was coming, how come He chose to still create them? Or why didn't He make them so they couldn't sin, or make it so the tree wasn't right there, or why didn't he post a guard at the tree?