Along the river Velillos is a very nice walking trail situated, which is passing through the canyon, that has been eroded by the river. This route is also called the Gollizno Route Trail - PR-A 84. You can start in the village Moclin itself, what will take you in total up to a 10 km walk or you can start at Fuente de Corcuela, what takes you a 5,5 km walk (return at the bridge before Olivares). The trail, that is starting in Moclin is also passing some historic rock paintings. See the Wikiloc route here (in Spanish) or this map (in English). From the walking bridge, just before the town Olivares the large hiking tour turns back to Moclin, or you return the same way back to the spring Fuente de Corcuela.