I have gotten in contact with Sean O'Rourke who runs EuroAdventures in Vigo. He offers customized tours ranging from 3,5 hours guided tours in Santiago old town to a 12 days wine and food tour in Galicia.
I have added many of his tours to my pages, you can have a look here:
http://www.santiago-today.com/what-to-do-in-santiago/
Greetings from Santiago de Compostela,
Ivar