There's not much to choose from... exit Porto direction Amarante (A4) exit to Mesão Frio (N101), then direction Peso da Régua (N108), cross the bridge and drive to Pinhão (N222), have lunch, visit Quinta das Carvalhas http://realcompanhiavelha.pt/pages/quintas/4
If you try to take the route to Covilhã via the national roads (non-toll roads) you'll take forever and it's very twist and turn... Return to Régua and take A 24 till Viseu area, then exit to A25 and follow it till Guarda. There exit to the city so that you can take N18 direction Belmonte and Covilhã. If by any chance you fell that you have time stop at Belmonte and visit. visitcentrodeportugal.com.pt/portuguese-juda…
A24 and A25 are electronic tolls only, do have a transponder on the car.
Thanks for your very detailed instructions. Do you know if Avis rental cars have transponders or is there a cash lane on the toll road?
The tolls on those 2 highways are electronic only (no booths), the cars at Avis have transponders but you have to sign an agreement in order to use it (the toll costs will be charged to your credit card), with that transponder you can also cross the electronic lanes (it's the green line - Via Verde) on the "conventional" highways, here's a map …estradas.pt/documents/1029518/ea7c598f-e24f…
Thanks. All this is very helpful information and makes a lot of sense. I am sure that it will make this segment of our trip much more enjoyable and stress free. Any suggestions for where to eat lunch?
BTW: I guess A4 and IP4 are the same?
Yes, it's the same.
There are only a couple of restaurants in Pinhão, by the river. Visit also the train station, it has nice tiles and a wine shop.