Prepare as directed and bake in 9 x 13 pan. While cake bakes, mix 1 cup sugar (or leave out as desired) with 1 can (20 oz.) pineapple crushed. Heat until sugar dissolves. When cake is baked, remove from oven and poke holes in it. Pour hot pineapple mixture over hot cake. Cool.
Prepare 1 large package sugar-free or regular vanilla pudding mix as directed. Spread on cooled cakes. Spread whipped topping over pudding. Then sprinkle with coconut and/or nuts.
Note: People who do not wish to add the extra sugar - pout the hot pineapple and juice over the hot cake. Then, mix together 1 small package vanilla instant pudding mix and one cup milk, then fold in an 8 ounce carton of whipped topping and spread this mixture over the cooled cake. Add coconut and/or chopped nuts.