In 13 x 9 inch baking pan, bake cake according to package directions. Meanwhile, in medium saucepan, combine pineapple with its juice and sugar; ... coconut and chopped walnuts.
Bake cake according to box directions; set ... bowl. Spread 1/3 pineapple over cake, next 1/3 pudding, then 1/3 strawberry filling, top with 1/3 Cool ... or other large bowl.