San Amaro sits square above the railway that you walked along a few kilometers ago; they tunnel through this hillside on their way to Santiago. There are two bars in town; the first has the most character and the most business. Friendly service too.
Turn left at the fork in the road, past the park, and onto a country lane.
The turn off for the Portela/Barro albergue is along this stretch, and it takes you uphill to the right.