For our Spain trip, planning on taking the train (RENFE) as follows:

Madrid to Aranjuez (round trip)
Madrid to Toledo (round trip)
Madrid to Granada
Granada to Ronda
Ronda to Cordoba
Cordoba to Madrid

Is it better to purchase the tickets in advance or can I do same day purchases?

Also, is there a ticket plan that can help me save or just buy the tickets per trip?

Thank you.

Purchase tickets on line and save money.
here is the website which gives you a step by step guide, with screen shots, to help explain the complicated process.
http://www.seat61.com/Spain-trains.h..._www.renfe.com

If you have a fixed itinerary and the money matters you purchase well in advance for discounted tickets, available on some of your journeys.

A hugely comprehensive guide on the subject -
http://www.tripadvisor.com/Travel-g1...ts.Online.html

RENFE sell multi. journey passes, whether they suit money wise you will have to do the maths comparison against advance discount purchase or on the day prices.

Oh, thank you very much both ribeirasacra and WomBatt for the tips. I'll check out the multi journey pass and do the math also.

Thanks for the thanks.