Layer 1: Mix a boxed Yellow Cake Mix according to instructions. Bake in a 10 x 15" pan for about 5 minutes less than it says for a 9 x 13" pan, or until toothpick/tester comes out clean. Cool to room temperature. (If you don't have a 10 x 15" pan, use a 9 x 13" PLUS an 8 x 8" pan. This layer needs to be thin.)
Layer 2: Mix 8 oz. of softened cream cheese, 2 cups of milk, and a small box of banana or lemon pudding powder. Spread on cooled yellow cake and chill at least 1/2 hour.
Layer 3: Drain a 20 oz. can of crushed pineapple. Spread on top of the pudding layer in pan.
Layer 4: Add a layer of Cool Whip -- 8 to 12 oz.
Layer 5: Sprinkle with shredded coconut and chill cake until time to serve.