I personally haven't been there, but my friend spent there few months. So i'll try to recall what he said to me about it (it was 2 years ago ...)
You can camp in the mountains, there is some hippie guys who built shacks from scrap wood/metal and they are growing weed in there, you can prolly crash at their place if you find em.
There are alot of street artists, performers, buskers so you have to be orriginal.
Almost no dumpster diving possibilities, there were a collective of about ~15 people who would gather 100 eur and would pay them to a security guard in some big ass mall so that the guard would let them go inside the storage facitilties and dig thrue trash in there.
If you are going to be camping, be prepared for the rain, they get real storms in there.
Well thats all i can recall for now, i don't have any contacts of the friend at the moment, because he is squatting in London. But if i'll end up in London in March (im thinking about Manchester/Leeds ) i'll pay him a visit and ask some more if you'll still be in need of the information.
