I also climbed Machu Picchu, visited the highest mountainous Lake Titicaca, attended Carnival in Rio de Janeiro, and took a ferry to Uruguay. After so much traveling in that region, I can definitely say why you should go to South America is to see the unique nature and feel the local atmosphere.
But I want to tell you that South Americans are different in mentality from us, but, by the way, they are also different from each other. The representatives of Argentina and Uruguay regard themselves more as Europeans and are proud of their colonialist origins. But at the same time they do not have the restraint, meticulousness, pedantry and thrift peculiar to Europeans. They are quite open, on the second day of acquaintance they invite you to visit them. Sociable - the average conversation lasts at least half an hour, regardless of who it is with. They are very slow and quite lazy, because of this in these countries everywhere huge queues, especially at bus stops and supermarkets. But you can learn from them the ability to relax. Their main way to relax is music and dancing. Even in a government organization like our passport office, women sit at their desks with portable music speakers and work to their favorite music. Sometimes they may even dance. Every party with friends ends with dancing. And far from the classical tango, as we want to believe, but a mixture of salsa, samba, tango and some other African motifs. Tango dance remained more for tourists to attract attention and make money. Modern young people practically do not dance tango.