Sorry for the punt but this board seems to be moving quicker these days and i have been busy preparing so have not been able to keep up.
i did want to say thanks for all the advice and kind offers.
I have done a bit of reasearch and found amtrak offer a 30 day pass for international travelers for $385 that goes anywhere in the US.
I am travelling with one other person but we are travelling thru vietnam, cambodia, thailand, malaysia, singapore, indonesia, australia and new zeland before we reach the US so god knows what will have happened but if i can manage to coral 3-4 people together a road trip may be on the cards.
On the other hand if i have managed scare off every other traveller near me and i am on my own i think amtrak is the way to go. If i run out of money though i may have to chance it hitchhiking
I set off thursday morning flying to hanoi so i'd like to say thanks again before i go.