... Caixa Galicia is the local bank in Galicia with the most cash machines... you will be walking for the most part in the province of Lugo, so do a search for this.
In general, most small towns will have a cash machine... and most supermercados will take your visa card as well (at least the bigger ones). I have a visa card from Norway that I use all the time while shopping, so it should not be a problem with foreign cards. The smaller stores in the smaller villages might take cash only, so some cash is needed.
yes there are cash machines, we used the Caixo (I think thats how you spell it) ones and we could access our UK accounts through switch cards - better than usingcredit cards - no interest charge. They were in all the major towns, Astorga, Molinaseca, Palas de Rei, Arzua and Santiago.
Yes, there are ATM's you can use. Remember you will have to pay a fee, which could be anywhere between 2 Euros or up to 5.
I leave for Spain May 9th, arriving in Barcelona on the 10th and going to Roncesvalles to begin the Pilgrimage. I've done parts of it 3 times....the first was 125 k's. The second, alone, 200 k's and then 3 years ago, 265 k's with my 14 year old daughter who walked the whole way with me and carried her own weight. I was pretty proud of her.
My concern now is that I can get to Roncesvalles by the evening of May 10th!