Add boiling water to gelatin mix in large bowl; stir 2 min. until completely dissolved.
Add enough cold water to reserved juice to measure 1 cup. Stir into gelatin. Refrigerate 1-1/4 hours or until slightly thickened.
Add COOL WHIP; whisk until blended. Refrigerate 10 min. or until mixture is thick enough to mound. Stir in pineapple, oranges, marshmallows and coconut. Spoon into 6-cup mold sprayed with cooking spray.