Set on a tiny spit of land just off Ambergris Caye, Belize's largest island, Cayo Espanto is the ultimate off-grid private island retreat. There are only seven castaway-chic tropical villas strung along the palm-covered shores, each with a private plunge pool, jetty and huge wraparound terrace jutting out into the Caribbean Sea. For ultimate privacy, there is Casa Ventanas, which sits on stilts over the water at the end of a long wooden pontoon, while each villa comes with a dedicated butler.
Days here take on a lazy rhythm; you're unlikely even to see another guest, and much of your time is spent on the water, paddle-boarding, kayaking, diving and snorkelling - both the magnificent Belize Barrier Reef and the famous collapsed limestone cave the Blue Hole are within easy reach.