Using a sharp knife and cutting board, cut the watermelon into small, uniform cubes, ensuring no seeds remain and the pieces are roughly 1-inch in size.
2 cups watermelon cubes
Peel the cucumber, then thinly slice into rounds or half-moons using the knife and cutting board. Arrange the slices in a bowl.
1 cup cucumber slices
Crumb the feta cheese into small pieces and add to the mixing bowl with the watermelon and cucumber.
0.5 cup feta cheese
Optional: Drizzle the olive oil evenly over the ingredients in the bowl, then season with salt and black pepper according to taste.
1 tablespoon olive oil, to taste salt, to taste black pepper
Gently toss all ingredients together with a large spoon until evenly combined, making sure the feta is well distributed.
2 cups watermelon cubes, 1 cup cucumber slices, 0.5 cup feta cheese, 1 tablespoon olive oil, to taste salt, to taste black pepper
Transfer to a serving platter or bowl and serve immediately for a fresh, crunchy salad with a colorful presentation.