We are looking for boat transport from Pinhao to Porto (1 way) on Friday Oct. 26 (5 of us)
The excursion boats have probably stopped running for the winter.
All you can try is what anyone can ie search 'Douro boat tours' and see if any are still in operation.
Otherwise you have to go by train.
You will find lots of different boats, some going to Porto and others just going to Regua. It is a really beautiful trip