Hi FW
Did Galicia last October...in torrential wind and rain! In fact it was while battling to take photos at barona that my camera gave up and I had to buy a disposable for our two days in Santiago.
Somewhere on here there is a thread I posted on return giving detail of Rock Art sites and other points of interest. Porto de Son has a little museum all about pre-history and Castle de Barona is just along the coast.
We didn't get to any rock art sites though there were a couple signposted from the main road just east of Porto. Visited a great quoit down on the tip of the peninsular, that was well signposted to but sadly a lot isn't.
I will go hunt for the thread and get back to you. Any other info you need just ask.
Santiago is stunning...and full of bars! I think there is around 40 in the narrow street leading up to the cathedral!...foods not bad either!
Mr H