Take a cocktail shaker and put some ice cubes in it, depending on how chilled you want your cocktail to be.
Now pour one part of Malibu pineapple rum in it along with one and a half parts of Bacardi 151 rum and five parts of pineapple juice.
Turn on the shaker and mix all the contents of the drink well.
Take a highball glass and strain the mixture from shaker into the glass filled with ice.
Garnish the drink with a pineapple slice and then serve.