Ask Marion, she just criss-crossed a good share of the US last year, using buses and I think the train in some instances.

If you do the train, one ride not to be missed is east or west over the Rocky Mountains in Colorado in the VistaDome cars on Amtrak. The most dramatic is climbing up from Denver, switchback rails going up and up, to where one can see the tail coming round, from the fronts already snaking around the next curve. The mountains are glorious, then dropping down on the West side through Glenwood Canyon is spectacular and if you ride it all the way down to Grand Junction...there's at least a couple of us nearby.:-)

I agree with all of the above. Have lots of time and don't forget this country has great, LONG distances.:-)

kat