What are the most worthwhile things to do in Torres del Paine on a first visit?

CONAF's protocol is explicit about how the circuits work. Entry is through the Laguna Amarga, Sarmiento or Serrano gates, and guardhouses on the mountain trails keep self-registration books recording name, age, identity number, planned overnight stop and expected exit time. Rangers may expel visitors found staying overnight without a reservation. The Macizo Paine circuit runs one way only, from Coirón towards Paso; the reverse direction is not permitted.

Age guidance is published and worth reading before you book a family trip. Children under 14 are not recommended on the Macizo Paine circuit and children under 12 are advised against the W and the other trails, with all minors accompanied at all times. For Paso John Garner specifically, minors aged 14 to 17 must be accompanied by at least 2 experienced adults. Some sectors of the circuits reach 1,200 meters above sea level, about 3,937 feet, and trekking alone is discouraged, with groups asked to move at the pace of their slowest member.

If you are not trekking, the park is still structured around timed access. The Base Torres trail from Laguna Amarga has a latest entry of 10:00 and a closing time of 16:00 from December to February, tightening to 09:30 and 15:00 in March and April. The catamaran across Lago Pehoé runs Pudeto 10:30 to 18:00 and Paine Grande 11:00 to 18:30 on its general schedule, which is what makes a one-way W itinerary possible at all. Between Grey and Paso there are two suspension bridges more than 20 meters, about 66 feet, above the ground.

In the deciduous Magellan forest zone, lenga — Nothofagus pumilio — is the dominant tree, while the Andean desert zone above it carries vegetation no more than 1.5 meters high with cover falling from 30 percent to zero, so the treeline reads as an abrupt edge rather than a gradient.

The protected area around the trekking routes is much larger than the trekking routes themselves. The UNESCO biosphere reserve totals 770,889 hectares, split into a 278,104-hectare core, a 374,933-hectare buffer and a 117,852-hectare transition zone, the last of which includes 27,063 hectares of marine area. Adesmia campestris is recorded there as a rare and exclusive species. Understanding that the core is roughly a third of the whole explains why the park funnels visitors onto a handful of corridors and polices overnight stops so firmly.

• Before you fly — Secure a bed for every night on the route; without one you cannot circulate for more than a day.
• At the gate — Enter through Laguna Amarga, Sarmiento or Serrano, and sign the registration book at each mountain guardhouse.
• On the trail — Respect the one-way rule from Coirón to Paso and the Base Torres cutoffs, which are earlier than most walkers expect.

The State Department's advice for the country is to exercise increased caution in Chile because of crime and civil unrest, which is a national framing rather than a Patagonian one but still shapes transit through Santiago. Extending a Chilean Tourist Card for a further 90 days costs US$100 at the Chilean immigration office, which is worth knowing if a weather delay stretches a trip. Physically, the constraints are the one-way circuit, the 1,200-meter sectors, the suspension bridges, the published age guidance and the early trail closures — a reservation does not override any of them. Guides are not compulsory in summer, and the protocol suggests accredited guides authorized under the applicable municipal ordinance rather than requiring one.

The when-to-visit question in this group gives the gate hours by month and the winter guide rule; the food question covers which concessions and shops are actually trading.