I think you are right as the majority of this crowd were students on summer holidays...
But I do hope you'll meet some interesting, nice people and sure you will. Portuguese wine is lovely, refreshing, especially after a long day's walk. They will recommend Vinho Verde, which cannot be found anywhere else in the world just in between Porto and Santiago. But my favorite is Portuguese rose...hmmm
Also, as a delicacy, try Pimiento's of Padron, they are little, tasty, roasted green peppers and pulpo if you like seafood. Otherwise food is a bit bland and rather oily but if you pick carefully you can find quality restaurants, just as we did in Pontevedra, where we ended up looking for ages but came across a family run restaurant and the cook was like my grandma! She took great pride in her cooking and you could definately tell that! Most delicious squid, tasty soup, and the flan! It was a real delight!
Try to ask for more than a bowl of greasy chips...
In Asturias we were lucky enough to taste Caldo Gallego although it's a winter dish but we never had enough of that! Gorgeous!
Aaaand ...if you had enough of wine, then why not try the famous Asturian sidra?
)
Enjoy your walk, I have to say I prefer walking alone...it's much more relaxing. But this time I was happy that my boyfriend was with me as I had a food poisoning and he had to carry my bag as well... poor darling. But we managed! Mind over matter!