On this Caribbean isle Robin McKelvie discovers low-key resorts, well-priced local dining and rare wildlife Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice I t’s hard to resist a dish of 10 chunks of fried fresh mahi mahi, especially when it costs just $10 and comes