I will be going on a package tour in Europe in May 2023 (sorry, Rick - with a competitor!). I have three full days in Portugal prior to the tour commencing. Plan to rent a car for that period, mostly over a weekend. Looking for suggestions as one or two sites to visit. Car rental will be from and back to the Lisbon airport.
By the way, the tour includes Lisbon and then areas to to east and south. Thus I am thinking of places north of Lisbon. I have never been to Portugal.