Cook the elbow macaroni in a large pot of boiling salted water until al dente, about 8-10 minutes. Drain and rinse with cold water to stop the cooking and cool the pasta down.
In a mixing bowl, whisk together the mayonnaise and apple cider vinegar until smooth and slightly tangy. This creates a creamy, flavorful dressing base.
Fold the cooled pasta into the dressing, gently mixing until the pasta is coated evenly and begins to feel sticky and creamy.
Add the drained pineapple chunks, chopped celery, chopped eggs, and chopped green onions to the pasta mixture. Carefully fold everything together, ensuring the colorful ingredients are evenly distributed.
Give the salad a gentle stir to combine all flavors. Taste and adjust with salt or additional vinegar if desired.
Cover the bowl with plastic wrap and refrigerate for at least 1 hour, allowing the flavors to meld and the salad to chill thoroughly.
Before serving, give the salad a quick toss to refresh the ingredients and check the seasoning, adding more vinegar or salt if needed.
Serve the tropical pasta salad cold, garnished with extra chopped green onions if desired. Enjoy the creamy, crunchy, and tangy flavors with each bite!