2 fresh pineapples with tops
1 1/2 cups cubed cooked chicken breast
3/4 cup chopped celery
1/3 cup reduced-fat mayonnaise
1/3 cup fat-free plain yogurt
2 tablespoons chutney
1/2 teaspoon salt
1/4 cup dry roasted peanuts
1/4 cup flaked coconut, toasted
1 (11 ounce) can mandarin oranges, drained
1/2 cup halved green grapes