We've not been to the US before. Me and Mrs Stock are thinking about a cycle camping trip in in June 2013 lasting about a month. We're happy to link up different areas by using Amtrak if this adds to the experience.
As a couple in the late fifties we're used to 50 miles a day and have done Lands End - John O'Groats in the UK and Canterbury to Rome (1200 miles) this year. A section of the Pacific Coast looks good as does Yellowstone/Grand Teton. We also get the impression that just turning up at a campsite and asking for a pitch for the night and a shower is not always as straightforward as we're used to.
As complete beginners in the US some recommendations/advice would be really helpful. Ta.