In a large bowl, combine pineapple, mandarin oranges, and cherries.
Add coconut, marshmallows, and nuts (if using).
Gently fold in sour cream or whipped topping until well blended.
Cover and refrigerate for at least one hour to allow flavors to meld and marshmallows to soften.
Stir gently before serving. Serve chilled for a refreshing and delightful experience.
