Preheat oven to 350˚F. Grease 12 jumbo muffin cups; set aside. In small saucepan set over medium heat, melt butter, brown sugar and corn syrup until brown sugar dissolves and starts to bubble. Spoon evenly into muffin cups. Top with 1 pineapple round; place 1 maraschino cherry in center of pineapple. Set aside.
Prepare cake mix according to package directions, substituting pineapple juice for milk or water. Mix in oil, eggs and lime zest. Scoop batter over pineapple, filling cups about two-thirds full.
Bake for 20 to 25 minutes or until tester inserted into cakes comes out clean. Transfer to rack; let stand for 5 minutes. Invert gently onto baking sheet so that pineapple rounds are on top; let cool completely.
Meanwhile, carefully spoon out firm, hardened layer of coconut cream at top of can into bowl (reserve coconut water for another use). Using electric mixer, beat coconut cream, heavy cream, icing sugar and lime juice until light and fluffy; dollop over cakes. Garnish with remaining maraschino cherries.
For rum flavor, add 1 tsp. rum extract to cake batter or brush cakes with a little dark rum before serving.