More decisions have been made

Rick and his daughter booked their flights and will indeed join us for the last 6 days on The Camino! I'm happy they will be there to get a taste of and better understanding for what Tom and I are doing and.... be there for my Birthday :)  They will join us from Sarria to Santiago.

 This is last "100 KM stage" of the Camino is the minimum requirement to get your "Compostela" which is a kind of certificate. Pilgrims have been given "the Compostela" since the 16th century!

 We also decided that after we arrive in Santiago we will enjoy 4 days in Portugal to "deCaminoise " ( I made that word up but it sounds good to me ha ha ) before flying back to The USA and the reality of our regular lives again.
Question is what to do in 4 days Portugal? I was there 3 times as a kid but only in The Algarve. I have some thoughts but any suggestions are welcome.
 I do think we would like to stay in Central and Northern Portugal so we don't have to travel too many miles.