It's a very scenic park but not as dramatic as a place like Torres del Paine. Reminded me a bit of a some of the parks in the US.
There are shuttle companies that make the rounds to set stops in the park for $20/person. You can hop on and off but they only come every two hours and the companies don't cooperate with each other so you must use the same company that dropped you off. You purchase tix and board the shuttles by the water near the now defunct tourist office, around Fadul and Maipu.
You could also rent a car if you don't want to worry about timing your hikes to coincide with the shuttles.
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