Into a blender, pour 1 shot dark rum, 1 shot amaretto, 1/2 shot orange liquer, juice of 1 lemon, juice of 1 lime, 1/4 cup pineapple chunks w/ juice, 1 shot sugar syrup (to make sugar syrup, heat equal parts sugar and water stirring often until sugar is dissolved), 1/2 shot grenadine. Blend until the pineapple chunks are well-mashed. Pour unto a tall glass with ice, and top with club soda.
Best if enjoyed poolside or at the beach.