Wash the watermelon and peaches thoroughly. Slice the watermelon into bite-sized cubes, removing any seeds. Cut the peaches into similar-sized pieces, removing the pits. If using cucumber and red onion, slice cucumber into thin rounds and chop onion finely.

In a small mixing bowl, whisk fresh citrus juice with honey for sweetness until well combined.

In a large bowl, gently combine watermelon, peaches, cucumber, and red onion. Toss carefully to mix without bruising the fruit.

Drizzle the dressing over the fruit mixture and toss gently to coat. Let the salad chill in the refrigerator for 10-15 minutes before serving.

Serve the salad in a large bowl or colorful platter, garnished with mint leaves.