Add the ice to a large pitcher. Pour in the cherries, cherry syrup, lime juice, simple syrup, and soda. (You can add some lime slices to the pitcher too if you like.) Stir to combine.
Add some ice to glasses and pour in the cherry limeade. Garnish each glass with a lime slice if desired. Serve immediately.
Notes
To make the simple syrup: Add 1/2 cup water and 1/2 cup sugar to a small saucepan. Place over medium heat and cook just until the sugar has dissolved, stirring occasionally. Remove from the heat and let cool before using.I don’t recommend making this recipe too far in advance due to the risk of the soda going flat.