1 1/2 oz. Jamaica Rum (more Jamaica Rum drinks)
1 1/2 oz. Tequila (more Tequila drinks)
3 oz. Pineapple Juice (more Pineapple Juice drinks)
1 oz. Grapefruit Juice (more Grapefruit Juice drinks)
Shake with ice and strain into a cocktail glass over ice. Garnish with a slice of pineapple.