To visit San Sebastian, you could take a bus. The company Alsa offers about 9 direct buses daily. You can check it at:
For visiting Bilbao and Guernica, it would be much easier with a rental car. Although doing both in one day, it is going to be pretty tight even like that...
Since you are staying in Pamplona, another place close by that I would recommend you to visit would be Olite and its castle. Here you find some pictures and information:
Thanks for the information.
Yes, San Sebastian is a good one. By bus tickets at counter. No online
-:- Message from TripAdvisor staff -:-
This topic has been closed to new posts due to inactivity. We hope you'll join the conversation by posting to an open topic or starting a new one.
To review the TripAdvisor Forums Posting Guidelines, please follow this link: http://www.tripadvisor.com/pages/forums_posting_guidelines.html
We remove posts that do not follow our posting guidelines, and we reserve the right to remove any post for any reason.