In a large pot, boil pasta in salted water until al dente (firm) according to package directions. Drain and rinse under cold water to cool.
Meanwhile, chop the cucumber, grape tomatoes, bell pepper, and red onions.
In a large bowl, combine your cooked and cooled pasta, prepared vegetables, Italian dressing, and fresh parsley. Toss well to coat.
Season with salt and pepper to taste and gently stir in feta cheese.
Refrigerate for at least 2 hours before serving to allow the flavors to blend and the pasta to soak in the dressing.
