Iceland, Thailand, London best-value destinations: Lonely Planet

South Africa, India, Malaysia, Mexico, Bulgaria, Kenya and Las Vegas in Nevada rounded out the top 10, said the British-based company in its "Best In Travel 2010" guide.

The annual snapshot book captures "the world's hottest travel trends, destinations, journeys and experiences for the year ahead," Lonely Planet said.

The economic collapse in Iceland meant the island was no longer punitively expensive, said the guide, putting the beleaguered country at the top of its best-value list.

"Have you always wanted to discover this magical, mysterious country? To explore ice caps and volcanoes, and wallow in hot springs? Been put off because of the prohibitive prices? Well, 2010 is your year."

Thailand, at number two, remained "perennially good value", said the book.

"It's one of the cheapest long-haul holidays for European holidaymakers... visitors are always spoilt for choice regarding accommodation."

Meanwhile London's days as a costly destination were now over, Lonely Planet said.