1. Mix cake as directed on box.
2. Spread nuts and then coconut on the bottom of a greased 9 x 13 inch pan. Pour cake batter over coconut.
3. Combine cream cheese and butter or margarine in a saucepan. Heat over low heat until melted. Stir in confectioners' sugar, and spoon over batter.
4. Bake at 350 degrees F (175 degrees C) for 45 minutes.