One or two day walking trip frim San Sebastian or nearby..

Could anybody recommend a local guide/ company for a half day or one day walking trip from San Sebastian. I would like to walk part of the camino either from San Sebastian or possible Guetaria. I am traveling solo so could join a group and or have a local guide/walker show me the way. I was quoted €280 for a 3 hours walk from one company!! which i just cannot understand...i have joined groups for walks in other European countries for €20 - €35 so hopefully somebody will know a local who does this. i speak some Spanish.