Cut the watermelon in half and scoop out the flesh into a large bowl, leaving the rind intact.
Dice the watermelon flesh into bite-sized pieces and return it to the hollowed watermelon rind (or a punch bowl).
Add the peach slices, assorted fruits, and ice cubes to the bowl.
Pour the Sprite over the fruit and mix gently.
Garnish with mint leaves if desired and serve immediately.