That is a very good suggestion to think in terms of planning your trip as a connection of national (and state !) parks. The parks tend to be, by definition, in the scenic places, which are along the scenic drives. What a coincidence ! How handy !
The champions of finding scenic drives off of the interstates and shunways are the RVers.
Check the sites used by RVers for ideas. Here is a good one:
http://drivecrosscountry.net/T...r/Trip_Planning.html