The most famous trek in South America, and the one destination in this guide where turning up and pitching a tent is not an option. Every night of a multi-day trek has to be booked in advance with one of two companies that run the park's campsites and refugios, and in peak season the beds go before most people have booked their flights. The park fee itself is modest and fixed; what decides the budget is whether you camp or sleep in a refugio, and whether you carry your own food. Get the booking order right — beds first, flights second — and the rest is straightforward.
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