Mix the Rums and Juices: In a blender, combine the light rum, dark rum, apricot brandy, lime juice, pineapple juice, papaya juice (if using), grenadine, and powdered sugar.
Blend with Ice: Add a generous amount of crushed ice and blend until the mixture is smooth.
Prepare the Glass: Pour the blended mixture into a tall glass (preferably a tiki mug or a hurricane glass).
Add the 151-Proof Rum: Carefully float the 151-proof rum on top by pouring it over the back of a spoon.
Garnish: Garnish with mint sprigs and fruit slices.
Serve with a Straw: Add a straw, and it's ready to serve.