Read this page if you have no time to plan a full trip to Argentina. There are no extra words on this page.

When to Go
The seasons in Argentina are the reverse of New York or London. Buenos Aires is mild March-May and September-November, and hot December-February. Patagonia is considerably colder than Buenos Aires, so the best time to visit is between November and March.
Argentina Weather

Must-See Argentina:
Visit Buenos Aires, Iguazu Falls and The Perito Moreno Glacier in Calafate (Patagonia).

BONUS: Combining a trip to Argentina and Brazil:
Argentina and Brazil are neighboring countries and are easy (and smart) to combine into one vacation.

If you have 30 more minutes to plan your Argentina trip:
Read the following page that will give you a good introduction to the country you want to visit.
Argentina Trip Planning Guide

If you have no more time to plan:
Purchase a guidebook and call a travel agency specialized in Argentina tourism to have them book everything for you.
Guidebooks