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Looks like I'll be a day behind you. My flight to Porto lands Tue eve. I'm planning to stroll an easy day to Matosinhos from the cathedral on Wednesday, then continue up the coastal on Thursday.
Bom camino!
You don't say where/when your existing bookings are, which may impact your extra day options, but you could go to SdC and then do 3 days to Finsterra - then take the bus back to SdC.
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