If you're going to Alaska, get Church's book ("Traveler's Guide to Alaskan Camping")...and the milepost. Church's book is one of the best campground guide books I've come across, quite complete and not completely dry reading.
If you're interested in state parks, many states have some sort of a guidebook or pamphlet or something with the state parks listed available for the asking.
If you want KOA campgrounds, I think they have a directory available as well.
For things to do, if you're an AAA member, the tourbooks are a reasonable starting point. They are certainly not complete lists of everything one might want to do, but at least describe some of the attractions of the area. I think you can still get Woodall's or some other campground guide from them as well (for free) as a member, and of course a variety of good road maps.
Generally, though, online searching is often more productive than a lot of printed guides these days.