New All-Inclusive of the Year: Margaritaville Island Reserve Cap Cana, Dominican Republic The alliance between Jimmy Buffett’s Margaritaville and Karisma keeps yielding strong results, none more so than the newest addition to fast-expanding Cap Cana: the Margaritaville Island Reserve, 228-room retreat on the stunning sands of Juanillo Beach. It’s a departure from a largely uniform sea of properties in greater Punta Cana — and a refreshing, welcome change of pace.