Enrique Iglesias is a man of his word, and the Spanish crooner says he will indeed water ski naked — a promise he said he’d fulfill if Spain won the World Cup (which they did).Iglesias tells PEOPLE that he’s “waiting for a day off” to do his nude water sports, and in the meantime, he’s got some grooming to take care of. “I need to get my Brazilian wax before I do it,” he joked.And despite the warning by Miami police that he will likely be arrested if he’s caught in the buff, Iglesias says he’s more concerned that “there’s…