In a cocktail shaker, combine all the rums, apricot brandy, lime juice, pineapple juice, papaya (or orange) juice, grenadine, and bitters.
30 ml white rum, 30 ml golden rum, 30 ml dark rum, 15 ml apricot brandy, 15 ml lime juice, 30 ml pineapple juice, 30 ml papaya juice (or orange juice if unavailable), 15 ml grenadine, 1 dash of Angostura bitters