Chill a glass in the freezer for a few minutes to keep the drink cold.
Add crushed ice to a blender or cocktail shaker.
Pour 2 oz white rum into the blender or shaker.
Add 3 oz pineapple juice and 2 oz coconut cream.
Add 1/2 cup fresh pineapple chunks if using for extra body.
Add 1/2 oz lime juice if you want a brighter edge to the sweetness.
Secure the blender lid and blend on high until smooth and frothy (10–20 seconds) or shake vigorously for 20–30 seconds if using a shaker.
Rim the chilled glass with pineapple juice and dip into toasted shredded coconut for garnish.
Pour the blended mixture into the glass; strain if you prefer a smoother texture.
Float 1 oz dark rum on top by pouring slowly over the back of a spoon, garnish with a pineapple wedge, and serve immediately.