Grease a 9 x 13" baking pan. Prepare the cake batter according to the instructions on box. Cover the bottom of the pan with the nuts and coconut. Pour the cake batter evenly over the top. Melt the margarine in a bowl or medium size saucepan. Add the cream cheese and sugar. Mix well. Spoon the cream cheese mixture over the batter and bake for 40 - 42 minutes. You cannot test this cake for doneness because it is so gooey. ENJOY!