Katie had read somewhere to add a tablespoon of mayonaisse to the cake batter to make it extra moist. It worked!
I used a Duncan Hines white cake mix because they were on sale at a really good price at our local grocery store. The cake pans got a good coating of crisco and flour before the batter went in.
Also used a box of Betty Crocker fluffy white frosting mix that made a frosting that was very good and "marshmallowy" tasting. We put the flaked coconut in a ziplock bag and kept adding drops of green food coloring until we got the desired color we were wanting.