Mix and bake cake according to package. Bake in 2 8" pans or 1 9 x 13 pan. Mix together coconut, sour cream, sugar and Cool Whip. Spread mixture between layers and outside of cake or entire mixture on top of 9 x 13 cake. Seal tight with foil or airtight container. Refrigerate for a minimum of 24 hours. Can be kept for up to 3 days. You MUST use airtight container if saving for 3 days. Can sprinkle more coconut on top and decorate with maraschino cherries.