FIRST LAYER:
Dissolve Jello in boiling water. Add cold water and pour into loaf pan. Let it sit until firm.
SECOND LAYER:
Dissolve Jello in boiling water. Add cream cheese and beat until smooth. Cool. Add pineapple with the juice and the vinegar. Pour on top of the first layer. Let sit until firm.
THIRD LAYER:
Dissolve Jello in boiling water, then add cold water. Let cool. Pour over the second layer. Let sit in fridge until firm. Top with whipped cream.