1 box yellow cake mix
1 (14 oz.) condensed milk
1 (12 oz.) pina colada mix
1 (6 oz.) pkg. frozen coconut
1 (8 oz.) Cool Whip

Bake cake according to directions in sheet cake pan. Punch holes in cake while hot. Mix condensed milk and pina colada mix together. Pour over cake. Let stand 2 hours to soak up liquid. Spread with Cool Whip and put coconut on top.