Very close to San Sebastian, there are two very beautiful villages (You can make a visit on the day by bus):

• by Hondarribia:  https://share.google/BQk6Msl00ixDJDXeg (Line E20 by E20)
• Passages of San Juan: https://www.guiarepsol.com/es/viajar/vamos-de-excursion/un-dia-en-pasajes-san-juan-gipuzkoa/ (Ekialdebus line E01)
  

Time of Ekialdebus:

• by E01:  https://share.google/zPxtWcDZy97F2l8ut 
• by E20:  https://share.google/Pt0MzB0oU48ppNn9F  
  

It takes less than half an hour.

The two buses allow payment in metal. it is not necessary to buy transportation card. And they get in LA PLAZA GIPUZKOA.