You might want to go over to Braga as you get up North. It's quite a lovely, old city with a cathedral on (nearly) every corner. Pilgrim-wise, there is the shrine of Bom Jesus north of the city - quite impressive with an amazing view. It was on the Roman road, called Bracara Augusta way back then. There are also celtic ruins outside the city.
In addition.. in the center of Braga at the central square with a big round fountain is situated the Braga tourist center. Ask there how to get from there to the busstop to the Bom Jesus do Monte. It is a few hundered meters from there.
To the Bom Jesus-which is on the world heritage list of famous buildings -it is an about 5 kms walk.
If you walk from the tourist info onto the Sé cathedral , after some meters at a left corner you find a real authentic bar "a Brasileira " and have a drink in between the the locals. One of my favorite places.
As a musician I like to come in Braga every time I am in Portugal because Braga is a main center in the world for handbuilt traditional stringed musical instruments like o violão Português-wellknown for use in fado concerts-o Braginho and the cavaquinho ,a small instrument similar to the ukulele and used in Portuguese traditional and Brasilean choro music.
After one hundred meters at the left is the Sé cathedral. They ask an entrance fee to visit the church but you can get a free stamp if you ask for it.
In the month of may every year is a Roman festival with dressed up Roman soldiers and citizens -when you are lucky you will meet Julius Ceasar in person- , demonstrations of Roman fights, a Roman market etc. very nice.
Although Braga is not on the central route it is worthwhile to do the detour by bus or train from Barcelos-about 20 kms from Barcelos- and if you like you can stay in the albergue of Braga and walk from there on the caminho de Braga to Ponte de Lima to continue the central caminho from there. But then you will miss another gem on the central, albergue
casa da Fernanda. !
So up to you !
Bom caminho