Cook pasta according to package directions; drain and set aside.
Process cream cheese and next 3 ingredients in a food processor until smooth. Stir in pineapple.
Stir together pasta, 1/4 cup melted butter, and cream cheese mixture; spoon into a lightly greased 13- x 9-inch baking dish.
Stir together cereal, cinnamon, and remaining 1/4 cup melted butter; sprinkle over noodle mixture.
Bake at 350° for 45 to 50 minutes or until set.