Bring 3 quarts of salted water to boil. Add the pasta and cook 10-12 minutes, stirring often. Drain and rinse with cold water to cool pasta. Drain well.

In large bowl, beat pudding, milk and reserved pineapple juice for 2 minutes. Gently fold in pasta, pineapple, mandarin oranges, marshmallows and coconut.

Cover and refrigerate for at least 1 hour, but preferably overnight.