Fill a cocktail shaker with crushed ice.
Add the dark rum, coconut rum, grenadine, orange juice, pineapple juice, and lime juice to the shaker.
Shake well to combine all the ingredients.
Fill a tall glass with crushed ice.
Strain the mixture from the shaker into the glass.
Garnish with a slice of pineapple and a maraschino cherry.
"Enjoy your drink!"
Enjoy your meal!