Park accommodations range from free trailside campgrounds to luxury hotels with just about everything in between; in summer, reservations are almost obligatory at hotels and advisable at campgrounds and refugios. For options along the Paine Circuit [1], the “W” Route [2], and other trails [3], see the hike descriptions.
Links:
[1] http://www.moon.com/destinations/chile/southern-patagonia/parque-nacional-torres-del-paine/paine-circuit
[2] http://www.moon.com/destinations/chile/southern-patagonia/parque-nacional-torres-del-paine/w-route
[3] http://www.moon.com/destinations/chile/southern-patagonia/parque-nacional-torres-del-paine/other-trails