Within Spain, I would travel by train. If you are American, you can purchase a train pass that will let you hop on and off the train for a certain number of days, for a good price.
If not, if you have internet access, you can pretty much play it by ear. Otherwise, try to plan your trip ahead of time. Almost all cities have a tourism office that can help you arrange transportation. Bring a list of their addresses with you. They are very helpful.



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