Stop by Sotama Visitor Center for some useful tips before you start exploring. It's an one-stop shop for travel information.
You'll have no end of sightseeing choices when in Cillorigo de Liebana. Sotama Visitor Center is a great place to begin here, but there are lots of other worthy spots to visit. Santo Toribio de Liebana Monastery, Territorio Canopy, and Mogrovejo Tower are not far from the tourist information center and will top off your day nicely.