The Volcán Chaitén trail is short by Patagonian standards but not gentle. It climbs through recovering forest to the edge of the caldera, where you look into the pale, raw landscape left by the 2008 eruption.
On a clear day the view reaches back toward the coast and over the broken volcanic slopes. Take waterproof layers and proper shoes; the track is exposed near the top, and the payoff depends heavily on weather.