Have you look into travelling with Amtrack-the overnight train? You can purchase the pass onlineat Amtrack website, and you plan your trip for the whole month! You can go from north to south then connect to west going towards east, and see the whole country. Amtrack has a very comfortable private room too. The train stop at big cities and attractions. I think it's very fun to plan the trip, you can rent the car at each stop( big city) and then go around after getting info from the visitor info. in my opinion, I think everyone should try to travel by train around America once. It's very inexpensive and so much fun.