Place the watermelon and cucumber on a clean cutting board. Use a sharp knife to dice the watermelon into bite-sized cubes and slice the cucumber into thin rounds or half-moons.
2 cups watermelon, diced
Transfer the diced watermelon and sliced cucumber into a large mixing bowl. Gently toss to combine and distribute evenly.
2 cups watermelon, diced
Crumble the feta cheese over the top of the salad. Use your hands or a fork to break the feta into small pieces, distributing it evenly across the mixture.
2 cups watermelon, diced
Optionally, drizzle with a little olive oil and sprinkle with freshly ground black pepper for added flavor. Toss gently to combine all ingredients without breaking the fruit pieces.
Transfer the prepared salad onto a serving platter or individual plates. Chill in the refrigerator for 10-15 minutes before serving to enhance the flavors and refresh the dish.