Take the metro from Sao Bento to Trinidad (2 stops) then switch to the A line, and go to Mercado. You will need a 3 zone one way ticket for each person (1.80euro if you are recharging- a little more if you need a fresh ticket). Validate your...
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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