With 12 nights to spare you can get the best of Argentina, including time in Buenos Aires, before hitting the Lanin National Park for full-board at the Estancia Huechahue, from which you can divide five days between riding, white-water rafting and cooling off in water holes followed by a trip 650 miles south to Patagonia. Call Exsus Travel (020 7292 5050, www.exsus.com), price from £5,890.