Combine cake mix, undrained fruit, 1 cup coconut and eggs.
Blend; beat at medium speed for 2 minutes and pour into a greased 9 x 13 inch pan.
Sprinkle with brown sugar and nuts. Bake at 325 degrees F (165 degrees C) for 45 minutes. Bring butter, sugar and milk to a boil. Boil 1 minute. Stir in 1/2 cup coconut. Spoon over warm cake. Top with prepared whipped topping, if desired.