Bring salted water to a boil, add pasta and cook according to package directions.
While pasta is cooking, chop the vegetables. Set aside.
Once pasta is cooked al dente, drain and rinse under cold water.
Combine all ingredients in a bowl and mix well. Season with salt & pepper to taste.
Refrigerate for at least one hour. Garnish with additional feta cheese if desired.
Notes
For a lighter tangier salad, use Greek yogurt in place of mayonnaise.If using frozen shrimp, ensure the shrimp is cooked. If the shrimp is not cooked, it can be seasoned and cooked in butter or oil on the stove just until it turns pink.