I went to the Picos de Europa in 2018, it is very picturesque, the roads can be narrow and twisty in the mountains but the views are stunning, loads of scenery, loads of views, fairly cheap to eat out.
FYI, to keep the kids entertained I noticed that there is an outdoor adventure centre at Arriondas for river rafting / Kayaking / go ape type stuff.
A few places that I thought were special (see pictures)
1. North Coast, View point, 2 miles east of Llanes (Drone shot)
2. Scenery around Riano (we watched the Spanish cycle Vuelta 2018 there)
3. Walking part of the the Cares Gorge from Cain (Walking north, good gravel path carved out of the rock but some big drops after the first mile or so) The Drive to Cain is entertaining!
4. The Fuente de Cantabria Cable Car, west of Potes.
Hope this helps.
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