Add pink sanding sugar to a shallow dish. Run a lemon slice along the rim of a cocktail glass, coating with juice. Dip glass into sugar to coat the rim, set aside.
Add citrus vodka, lemon juice, and ice to a cocktail shaker and shake until chilled.
Strain cocktail mixture into the prepared cocktail glass. Top up the glass with Seagram’s Escapes Jamaican Me Happy.
If desired, garnish with a watermelon and lemon slice. Enjoy!