In and around Chanquín, several Huilliche-run campgrounds charge around US$2–3 per person, but the only formal campground within park boundaries is Camping Chanquín (US$4.50 pp), about 200 meters beyond Conaf’s visitors center. Designed for privacy, its 20 sites offer running water, firewood, showers, and toilets. At refugios or along trails, camping is free of charge. Conaf also has cabañas, but they have not been open recently.
Noncampers can try any of several Cucao hospedajes, among them Hospedaje El Paraíso (tel. 099/2965465, US$8.50 pp) and the slightly more upscale Posada Cucao (tel. 099/8969855, US$10 pp). All of them offer meals.
At Chanquín, just across the bridge, Parador Darwin (tel. 099/7999923, paradordarwin [at] hotmail [dot] com, US$11 pp) has very decent accommodations and excellent fish and seafood, as well as homemade bread and spreads made from local ingredients such as seaweed. A bit farther west, El Fogón de Cucao (tel. 099/9465685, elfogondecucao [at] hotmail [dot] com, US$15 pp) has both accommodations and a restaurant.
Cucao has a minimarket, and it’s possible to buy fresh fish, potatoes, and the like from local fisherfolk and farmers, but supplies are more diverse and cheaper in Castro [1] and Chonchi [2].
Links:
[1] http://www.moon.com/destinations/chile/sur-chico/insular-chiloe/castro
[2] http://www.moon.com/destinations/chile/sur-chico/insular-chiloe/chonchi