I don’t know how we successfully planned trips like this in the days before the internet. Each park/site/museum/hotel/restaurant/road has its own schedule of opening/closing, price lists, special programs, and on, and on!
Utah was the only state that did not include a highway map in their travel packet. (New Mexico’s guide came with a center-fold-like road map enclosed in the magazine. Effective and cost effective.) Many states gave you the option to download the travel guide immediately from their website (but I’m trying to conserve printer ink!!).