Preheat oven to 325 degrees.
Grease 9 x 13 inch pan.
Spread nuts and coconut in pan evenly.
Prepare cake as directed on package.
Pour over coconut and pecans.
Melt margarine and cream cheese with powdered sugar.
Spoon over cake mixture.
Bake 1 hour or until toothpick inserted in center comes out clean.