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There is a lot of smoke on this thread. Touring on a two or three day route doesn't take much preparation. Touring cross country might require that you prepare a bit more. Certainly, all tourers are not triathletes, but the "crazy guy" site has plenty examples of cross country tourers who gave it up because they were not prepared when they departed.
My pre trip training has three goals. First, I want to shake down the equipment on lots of 60 mile rides. Second, I want to build up my fitness to ride 60 miles each day and enjoy it. And third, I have to toughen up my posterior to handle the 5-6 hours in the saddle each day.
In any event, do what seems right for you and have a good trip.