I don't envy you your train trip Franca, ours would have taken 7hrs with about 4 changes so we decided to drive. Are you on an overnight sleeper? In taht case it will be totally painless.
I like posti selvaggi too, I hate with a vengeance bagni organizzati con lettini e ombrellini, but this place is free, plus it's in/near la Maremma which is an area I've always wanted to see.
I have no idea what films to recommend as have not been anywhere near a cinema or DVD rentall since leaving Milan. I sound like a real sad case, don't I.