Cook cavatappi according to package directions. Drain and let cool completely.
Meanwhile, in large bowl, whisk together olive oil, vinegar, garlic, mustard, oregano, honey, salt and pepper until combined. Stir in parsley.
Add cucumber, tomato, red pepper, onion, olives and feta to bowl; add pasta and toss well. Let stand for at least 10 minutes. Just before serving, toss with lettuce.
Serve with grilled chicken, fish, or pork tenderloin if desired.