Bus & Taxi Colectivo
Taxi colectivos, with numbered routes, are only slightly more expensive than buses (about CH$500, or a bit more late at night and on Sundays), but far more comfortable and much quicker.
Cars are a good option for exploring Torres del Paine, but renting one in Chile to cross the border into Argentina gets expensive due to international insurance requirements. If heading to El Calafate, it is best to rent your vehicle in Argentina.
Punta Arenas has Chilean Patagonia's most economical rental rates, and locally owned agencies tend to provide better service. Recommended Adel Rent a Car provides attentive service, competitive rates, airport pick-up and good travel tips. Other choices include Hertz and Lubag.