List of places to visit, recommendations?

I created a "States" folder on my computer and then did a search on "(state name) tourism" and created a sub-folder for each. I've found that most states like visitors (read:tourist dollars), so they have a pretty good list of things to see and do. I supplement the info with a visit to the first rest area as I enter a state. I can take a bathroom break, stretch my legs, ask questions of the counter folks about road work, and browse the wall of pamphlets for lesser known things to see in that state, and sometimes, free coffee. :)
More than once, I've spent more time in a state than I had planned.