Only bit of advice I can give is make bl**dy sure you've got a full visa or be very sure you're careful what you say at US immigration.
There was a piece it this weekend' s Telegraph about a 45 year old Brit who was deported straight back to UK from the airport when he mentioned he was going to have flying lessons in his holiday and was found not to have a full visa.
Ring Richard Gentil or Nikki at NAC asap.
If you do get there you'll love NAC tho' what wx will be like in August G*d alone knows. It was fab in feb.
Happy (and legal) flying.