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 in the center comes out clean.
04 - Let cake cool for 10 minutes. Using the handle of a wooden spoon, poke holes evenly across the entire cake, spacing approximately 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 absorb into the poke holes.
07 - Whisk together instant vanilla pudding mix, cold milk, and pineapple juice in a separate bowl until thickened, about 2 minutes.
08 - Spread the pudding mixture evenly over the surface of the cake.
09 - Cover and refrigerate for at least 1 hour until completely chilled and set.
10 - Spread whipped topping evenly over the chilled cake.
11 - Sprinkle toasted coconut over the top. Garnish with fresh pineapple chunks and maraschino cherries if desired. Slice and serve cold.