You have choices on the coastal. You can walk the "traditional" marked coastal that is a combination of walking on boardwalks, the street, sometimes the sand, and in the hills above the ocean. Or you can walk almost the entire way in Portugal, on...
I walked that Central Route from Porto a couple of years ago in 13 days. I was keeping my days under 20 km where I could. A 12 day pattern seems entirely reasonable to me if you think you can do a longer distance than that regularly, but you...
In my 60's I did it in 8 days so I would guess 12 would be fine. Only caveat is that I walk everyday all year-round and so I never need to train for a Camino. And my preferred stage length is about 30 km.
12 days is fine, I did it in 10 days this July. For training, just walk everyday and in some days do long distance walks.
Day 1: Sé Cathedral–Foz do Douro – Matosinhos (12 km)
Day 2: Matosinhos - Vila do Conde (24 km)
Day 3: Vila do Conde -...
I enjoy going to the lighthouse, quite a walk to and from town but the walking is why I am there in the first place. Not sure it's worth a day but as Tinker says, good bus trip if you want to see it without the walk.
I found Muxia a better place...
I've just been walking the Norte with all my insulin (for 5 months away) stored in Frio bags. At night, I'd ask the hospitalero/hotel to put them in the refrigerator for me, which gave a cooling head start for the next day. We've continued...
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