Step 1

In a large bowl, dissolve the lime gelatin in 2 cups of boiling water. Add 2 cups of cold water and stir. Pour into a 13x9-inch dish and refrigerate until firm but not set, about 1 hour.

Step 2

In a large bowl, dissolve the lemon gelatin in 1 cup of boiling water. Add the marshmallows and stir until melted. Cool for 20 minutes.

Step 3

In a small bowl, beat the cream cheese and mayonnaise until smooth. Gradually beat in the lemon gelatin. Stir in the pineapple. Carefully spoon the mixture over the lime layer in the dish. Chill until firm but not set.

Step 4

Dissolve the cherry gelatin in 2 cups of boiling water. Add 2 cups of cold water and stir. Spoon the mixture over the lemon layer in the dish.

Step 5

Refrigerate the entire gelatin salad overnight. Cut into squares and serve with a dollop of Cool Whip.