Cerro Caracol rises directly behind the city centre and is the easiest piece of nature reachable on foot from Concepción's downtown. Trails — paved and dirt — wind up through eucalyptus and native quillay to a series of miradores looking back over the city, the Biobío river, and on a clear day all the way to the coastal range.
The Mirador Alemán is the main viewpoint, with picnic tables and a small kiosk that opens on weekends. Allow about an hour to walk up from the city centre, or take a taxi to the top and walk down. The hill is also threaded with mountain-bike tracks; on a weekend morning, the whole place is alive with families and runners.