Backpacking Portugal, Spain, France. Ideas?

I am backpacking through Portugal, Spain and France with my two younger brothers this July... I am 19, they are 17 and 15.

We want to do it for as cheap as possible. We don't mind roughing it (we usually travel to 3rd world countries in Asia.)

We want fun, excitement, and cheap. Lol, that's pretty much it.

Any ideas of good hostels, campsites, eurorail passes, attractions?

Anything will help. I am a good traveler, but Europe is a totally new thing for me!

Thanks!!

And any opinions, or comments are great!Backpacking Portugal, Spain, France. Ideas?
cliff diving.water below is optional

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