It depends on your nationality and destination — many nationalities can enter countries like Peru, Argentina and Colombia visa-free for short tourist stays, while others require a visa or reciprocity fee. Check per country before you travel.

Each country has its own currency. US dollars are accepted in some tourist spots but shouldn’t be relied on everywhere — withdraw or exchange local currency after arrival.

Yes, at high-altitude destinations like Cusco or La Paz. Acclimatize gradually, stay hydrated, and consider spending a day at altitude before strenuous activity.

May–September (dry season) suits Andes trekking best; the Amazon is accessible year-round but wetter from December to May.