Another great adventure to look forward to, and I for one am looking forward to the trip report and some photos !
I always do that but also understand you will never get to see them all ! It's great to know what is where in case you have some spare time, and that's the enjoyable part of researching. Even then, you will also have the unexpected surprises as you make your way along.I also made the mistake of finding too many attractions in one area and penciling them into the trip.
Of all the things we 'pack' for a holiday, knowledge is not a burden to carry ! ;-)I think all the planning and research has really given me some history lessons on the USA.
Have a great trip !