Dissolve gelatin in boiling water-add the pineapple juice. Chill until starting to set. In the mean time, add sugar to the rice, stir until well mixed, and set aside. Whip dream whip with milk and orange extract until stiff. Refrigerate. Remove jello mixture when it has started to set and whip until light and frothy. Carefully fold into the jello, the whipped dream whip, sweetened rice, pineapple and marshmallows. Place in a flat pan and chill until firmly set or overnight.