In a large mixing bowl, combine the egg whites, water, vegetable oil, almond extract, cake mix, and 2/3 cup pineapple juice. Using an electric hand mixer, beat the mixture on medium speed for 2 minutes. Pour the batter over the cooked pineapple. Bake for 28 to 30 minutes until the cakes begin to pull away from the sides of the pan and the tops are golden. Allow the cakes to cool for 15 minutes. Place a piece of parchment paper on top of the cakes. Put a baking sheet, upside-down, on top of the parchment paper. Flip both pans over and allow the cakes to cool completely while still in the Bundt pan, about 1 hour. Unmold the cakes and place on individual serving plates.