Heat over to 350°F. With mixer, beat eggs with 1 cup water and 1/3 cup mashed banana. Add cake mix and beat until combined. Divide between two greased, floured 8 inch cake pans. Bake 35 min. or until a toothpick inserted in centre comes out clean; cool. Blend frosting and remaining banana. Cut each layer in half. Spread frosting between each layer, then frost outside of cake. Press coconut onto sides of cake and garnish with fresh fruit and sliced banana, if desired.