Icing:

9 oz. Cool Whip
1 c. powdered sugar
1 c. sour cream
1 tsp. vanilla
1 c. coconut

Mix all ingredients. Ice first layer; sprinkle coconut over icing. Ice second layer and sprinkle coconut. Ice top and sides and sprinkle coconut. Wrap cake good with Glad Wrap and refrigerate for 4 days.