Line a 4Quart round glass bowl with plastic wrap and set aside.
Drain pineapple can reserving the juice, you should end up with 1 cup liquid. If not then add more cold water to reach one cup.
Tear or cut cake into small pieces.
In a bowl or measuring cup dissolve gelatin in 4 tablespoons cold water. Add boiling water, sugar, lemon juice and pineapple juice. Mix everything well.
Refrigerate until mixture thickens about 2 hours.
Fold in pineapples and 4 cups of cool whip.
Arrange a layer of cake pieces at the bottom of the glass bowl then top with a layer of the pineapple mixture.
Continue layering until done and ending with a layer of cake. Refrigerate for 8 hours or overnight.
When ready to serve, turn the cake onto a serving plate and remove plastic wrap.
Cover the cake evenly with the remaining two cups of cool whip and sprinkle generously with coconut flakes.
Top with few cherries to decorate.