Mix the ingredients: In a large mixing bowl, combine 1 can crushed pineapple (20 oz, drained), 1 package instant coconut cream pudding mix (3.4 oz), and 1 cup shredded coconut. Stir gently until everything is well mixed and the pudding mix is fully incorporated into the crushed pineapple.
Add whipped topping: Fold in 1 container whipped topping (8 oz, thawed) smoothly into the mixture. Use a spatula to ensure the whipped topping is evenly distributed without deflating the mixture too much. You want it to remain fluffy!
Chill the fluff: Cover the bowl with plastic wrap and place it in the refrigerator. Let it chill for at least 1 hour to allow the flavors to meld and for the mixture to thicken slightly.
Serve and enjoy: After chilling, uncover the bowl and give the fluff a gentle stir. Spoon it into serving bowls and top each portion with maraschino cherries (optional) for a delightful garnish and an extra splash of color.