Melt butter in 9 x 13" pan. Add pineapple and brown sugar. Mix in coconut. May add some diced or sliced maraschino cherries (the amount is your preference). Add enough water to pineapple juice to make 1 1/3 cup liquid. Combine cake mix, pineapple pudding mix, eggs, and liquid in bowl. Beat until smooth. Spoon over mixture in pan. Bake 30 - 35 minutes at 350 degrees. Let set 5 minutes and turn out onto a tray. Needs no frosting. ENJOY!