What country to visit for 4 days?

Holaa & ola !!

I will be finsihing my trip in Argentina + Uruguay with 4 extra days. I am wondering which cities/countries I can check out with my extra time. I really like history, cities, nature.

I’m thinking of Santiago (but I will go to Chile again and do a proper travel of Chile, so it might be a waste of time lol). Or Guatemala and Paraguay, but I’ve heard Paraguay is not nice for tourists. A lot of the countries I want to visit tend to require more time like Brazil, Ecuador, etc :(. I’ve been to Peru, & CDMX, so any other places are appreciated!