I will be arriving in Punta Arenas and have about 5 days for Torres del Paine. I intend to do the W circuit, which is about a 3-5 day flight. I'm trying to decide how to approach the trek coming from Punta Arenas and which refugios to stay at. Also, is there a charter bus to and from the entrance of the park to Punta Arenas? I'm just starting to research it now.