Google "Tourism" for the various states. Many, of not all of them, will send you information about their state including places and events. You can usually order it on-line at no cost.
Responses here will vary, all dependent on the views and interests of the respondents. We are an eclectic bunch, with varying ideas on where to go and what to do. Those with children look for one thing in an RV park; those without perhaps are not interested in game rooms, recreation activities, etc.
We've been to almost all of the states and eight Canadian provinces - something different in all of them.
And if you are ever in western Nebraska, be sure to see The Tree. It's a "don't miss" attraction.
GM