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Tom, I stayed on the road into Miono and found the tunnel easily. I think the advice to ignore the arrow is to get you to proceed directly to Miono and not get diverted if you are going to use the tunnel route
Attached is a shorter and interesting alternative approach to Castro from Portuagalete that was posted on the forum a while back, saves quite a few kilometres. Took this route in 2015 and it is very easy to follow.
The fishermans name is Mario, his number was +351 963 416 259 in April 2016, otherwise you can get his number from the bar around the corner from the albergue in Caminha. He charged 5 euros per person.