We just finished a trip, from Feb 27 to Mar 21, 2014, to part of South America with cruise and land tours of pre-cruise and post cruise covering countries of Brazil, Argentina, Chile, Uruguay and Peru. It was a lot of walking and slow trekking up to 3,700 to 4,000 M. Places are very scenic. Key spots are Iguacu (Brazil) / Iguazu (Argentina) falls, and Machu Picchu - Lost (Stone) City of the Incas.