Noah gets off the Ark, there is a covenant God makes with all the earth. The Rainbow shall stand as a sign that never again will He destroy the earth by flood.
Noah becomes a farmer and in peace time, he relaxes his guard and slips into sin.
Yet his life 120 years faithful building the Ark, gathering food and feed, 1 year on a floating barge, all of that is not out weighed by sin. Noah was a mighty man of God, and in the Hall of Faith.