Hi, too late for the OP now, but one of the best walks for me, on the entire Lisbon to Santiago stretch, was the walk from the centre of Porto, alongside the river, to Matoshinos. It is only 8 kms, and there is so much to see and experience. Watch the boats on the river, stop and have an ice cream, watch the kids having fun on the beaches, enjoy a coffee in a beach café, and sample the sardines on the street stalls near Matosinhos. It is so different from every other day on the caminho, it shouldn’t be missed! Get the bus back into Porto to spend the night, returning by bus to Matosinhos next morning to continue the walk over the bridge. Jill