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Put a few ice cubes in a shaker glass, then add 4 or 5 fresh mint leaves. Fill shaker with ice.
Add 2 oz. Jamaican rum, 2 oz. fresh lemon-lime juice (equal parts fresh-squeezed lemon and fresh-squeezed lime), and a good splash of simple syrup. Shake, preferably to a reggae beat.
Pour all, including ice, into a tall glass. Top with club soda, and garnish with a sprig of mint and lime slices.
Adjust glam shades, apply sunscreen, and enjoy.