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In Argentina you can travel all around without a car , if you organice your trip you can do it completly in Bus and Train. Depends of your budget, you can rent a car too.

Argentina is a way long an depends where are your destinations you need to know some things if you are renting a car.

The roads are generally 2 ways traffic, like the county roads in usa, the towns are usually far away one from the other, so you have to be carreful about filling your tank, I have been driving hours without seing a gas station( mainly in La Patagonia).

Betwen the big cities there are bus service daily, for others destinations you have to ask ahead for knowing the frecuency and the schedule.

If you are gonna move around Buenos Aires city and may be going to the beaches, bus is fine . In Bs AS city you can ride Taxis or subways around downtown .

We have booked a wonderful trip with www.chimuadventures.com all over Argentina, Brazil and Peru. They made it very easy, and booked all our accommodation, transfers and tours. Distances are quite large so we are flying for the majority of it, and taking some buses especially around the southern part of patagonia where it is a bit easier. I can definitely recommend them as a travel/tour company. I hope that helps you!