2 lg. cans unsweetened pineapple juice
1 (12 oz.) can frozen lemonade
1 (15 oz.) can cream of coconut
1 fifth light rum
7-Up

Combine all ingredients except 7-Up. Pour in tightly covered container and place in freezer until frozen, may take several days. To serve, fill cocktail glass half full of slush. Fill to top with 7-Up.