Nice quiz. However, I don't see the point in giving away the last name of the Nobel Prize Winner and only guess his first name... Takes away all the challenge!!!
Neruda is also well-known enough that his last name should not be given away. Anyone who's ever studied or read poetry or South American literature with any measure of depth should know him.
This is a really good quiz except the flag question! It doesn't require any knowledge about Chile; how about asking for the colours on Chile's flag, or what object is on it?
The southernmost point of Chile is Águila Islet in the Diego Ramirez Islands at 56°32'16"S. Cape Horn is at 55°58'48"S. So while Cape Horn is close and more famous, it is not in fact the southernmost point. Águila Islet lies about 108 km southwest of Cape Horn.