01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan thoroughly.
02 - Combine yellow cake mix, eggs, crushed pineapple with juice, vegetable oil, and water in a large bowl. Beat until smooth and well blended.
03 - Pour batter into prepared pan. Bake for 28-32 minutes or until a toothpick inserted into the center comes out clean.
04 - Let cake cool for 10 minutes. Using the handle of a wooden spoon, poke holes all over the surface of the cake, spacing about 1 inch apart.
05 - Whisk together sweetened condensed milk and coconut milk in a medium bowl until thoroughly combined.
06 - Slowly pour the milk mixture evenly over the warm cake, allowing it to soak into the poke holes.
07 - In a separate bowl, whisk together instant vanilla pudding mix, cold milk, and pineapple juice until thickened, about 2 minutes.
08 - Spread the thickened pudding evenly over the cake surface.
09 - Cover and refrigerate for at least 1 hour, or until completely chilled and set.
10 - Spread thawed whipped topping evenly over the chilled cake surface.
11 - Sprinkle toasted coconut over the top. Garnish with fresh pineapple chunks and maraschino cherries if desired. Slice and serve chilled.