Drain pineapple. Add water to make one cup. Heat until boiling. Dissolve Jello in hot liquid. Cool. Gently stir in ginger ale. Chill until partially set.
Meanwhile, blend drained pineapple and cranberry sauce. Fold into Jello mixture. Turn into 9x9x2 pan. Chill until firm. Prepare topping according to package, fold in cream cheese. Spread over gelatin.