Boil the pasta in lightly salted water( boil in a medium sized pot, with 1 tsp of salt), until it's al dente.
Drain the pasta once done, and rinse it under cold water to stop the cooking process.
In a large bowl combine the mayonnaise, mustard, and lemon juice. Mix until well combined.
Now sprinkle in the cajun seasoning, and old bay seasoning. Mix well.
Add in the minced garlic.
Add in the seafood, and toss or stir in the bowl until it's covered with the dressing.
Add in the onions, celery, and olives.
Next add in the elbow macaroni pasta, and fold all of the ingredients.
Sprinkle in the dried parsley flakes and fold the ingredients.
Cover the pasta, and refrigerate until it's nice and cold.
Serve and enjoy!