We will be traveling to Portugal in early October, and would like to visit the Paiva Walkways for the day. I don't believe there are public transportation options (as I've looked on many different occasions). It seems like the only options are to rent a car for the day, or perhaps join a tour? Ideally I'd like to have control of my own time if possible, so if we were to rent a car, how difficult is the drive from Porto to the walkways?
Of course, if there are public transportation options, please let me know as well.