In a small bowl, whisk together the lime juice, olive oil, honey, sea salt, and black pepper to create the dressing.

In a large serving bowl, gently combine the cubed watermelon and fresh blueberries.

Drizzle the prepared vinaigrette over the fruit mixture and toss lightly to coat.

Carefully fold in the crumbled feta cheese and chopped mint leaves just before serving to maintain their texture.

Serve immediately or chill in the refrigerator for up to one hour.