1 box yellow cake mix
1 can sweetened condensed milk
1 (8 or 10 oz.) pina colada mix
1 (8 or 10 oz.) cool whip
1 small can coconut
1 large can crushed pineapple
chopped pecans as desired

Mix cake as directed on box. Pour into sheet cake pan, and bake until done.
Mix milk and pina colada mix. When cake is done, poke holes in cake while it is still hot. Pour milk mixture over holes and then spread pineapple on top. Refrigerate overnight. Spread cool whip on top, then sprinkle coconut and pecans on top.

This was on the net a while back.