//
Have a look at Argentina, Brazil, and Paraguay all at a glimpse from this very scenic viewpoint, while cargo freighters slowly make their way along the water. Brazil and Paraguay have their own markers (you can see each one from the others if you have binoculars), but Argentina's is debatably the best one to visit, since entry is free (unlike Brazil's), it's on higher ground than the other two, and you can get the Brazil-Paraguay suspension bridge in the same picture.
Be sure to stop by this beautiful, peaceful little garden which is full of hummingbirds. The owner has been placing feeders for wild birds for 40 years. None are in a cage. Great photo opportunities abound. There are other birds, as well, but the different types of hummingbirds that come to feed, perch and just fly around is amazing. It is a great place to sit and watch and reflect. (There are no other services inside, and advance reservations are preferred.)