Chill everything: Refrigerate juices, soda, and spirits for at least 2 hours. Cold ingredients keep ice from melting too fast.
Mix the base: In a large pitcher, combine white rum, coconut rum, blue curaçao, pineapple juice, coconut water, and lime juice. Stir until fully blended.
Sweeten to taste: Stir in simple syrup 1–2 tablespoons at a time. Taste after each addition. You should taste bright citrus with a smooth, tropical finish.
Add bubbles before serving: Pour in the chilled lemon-lime soda or sparkling water and give a gentle stir to keep the fizz.
Ice and garnish: Fill glasses with ice. Pour the punch over the ice. Garnish with pineapple, cherry, and lime. Add mint for aroma.
Double or triple the recipe depending on your crowd size.
Add a large ice ring made from pineapple juice and water to keep flavor strong while it chills.
Top with soda right before guests arrive.
