Preheat oven to 350 degrees. Grease and flour a 9-by-13-inch baking pan. In large bowl, combine flour, granulated sugar and baking soda. By hand, stir in eggs, nuts, coconut and pineapple and its juice. Pour batter into prepared pan. Bake 35 to 40 minutes or until cake tests done. Let cool on wire rack. While cake bakes, prepare topping: With electric mixer, thoroughly blend cream cheese, margarine, vanilla and powdered sugar. Spread topping over warm cake.