- In a large pitcher, stir together the orange juice, pineapple juice, and lemon juice. 
- Add the grenadine syrup and stir gently to create a beautiful gradient effect. 
- Refrigerate the punch until you're ready to serve. 
- Just before serving, add the chilled lemon-lime soda and stir once or twice. 
- Fill glasses with ice cubes and pour in the punch. 
- Garnish with orange slices, lemon slices, and a few mint leaves if you're feeling fancy. 
- Serve immediately and enjoy your trip to paradise—no plane ticket required.