good walks in Picos de Europa

These folks have, but I haven't.
I recall a few years ago an arduous, cross-Picos trek by a couple. Unfortunately, I don't remember the URL
I do know that there are trail guidebooks available.

Link doesn't work sadly - maybe I'll repost on trekking thread.

Suiko, does it have to be in the Picos? I am not an expert in walks but an area in Cantabria that we found highly fascinating, intriguing and picturesque was the 'Valle del Pas', south of Santander.
One of the things that makes this valley so special are their people - the 'Pasiegos' - one of the last semi-nomadic herdsmen in Europe. Each Pasiego family has several (sometimes up to 10) houses (well... more like stone huts) and each house is occupied only in a certain period of the year. You can see clusters of these houses everywhere in the valleys of river Pas and Miera.
A very walkable area where you won't see many tourists.

Not done much walking in Asturias but here are a few websites that maybe of help:
http://www.asturnor.com/</a><BR><a href="http://www.asturiaspicosdeeuropa.com/english/index.html">http://www.asturiaspicosdeeuropa.com</a><BR><a href="http://www.linearural.com/">http://www.linearural.com/</a><BR><a href="http://www.infoasturias.com/action/InfoasturiasEntrada?setLocale=en&metodo=entrada">http://www.infoasturias.com</a><BR><a href="http://www.picosdeeuropa.com/">http://www.picosdeeuropa.com/</a>

Thanks, but Picos is the easiest area to research, and one of the best as regards facilities (esp refuges). We have three full days only, so it has to be possible to research all the logistics (public transport etc) beforehand. And my gf wants to go to the beach for the last day, so Picos seemed good, as I know it a bit and Llanes, my favourite N Spanish resort, is nearby. The pasiegos, btw, are not unique in their mountain agricultural system - similar set-ups exist throughout the Cantabrian mountains, from Ancares in Galicia, Somiedo in Asturias, as far as the valle de Pas.