Preheat over to 350 degrees. Grease a 9X13 pan. Mix cake mixture according to directions. Sprinkle nuts and coconut evenly in bottom of the greased pan. Pour cake mixture on top and set aside. Mix butter, sugar and cream cheese until creamy. Spoon this mixture over the top of the cake mixture but do not mix into the cake batter. Bake 40 to 45 minutes until cake is done. Cool completely before slicing.