My 2 cents worth:
West Coast
Alaska, Astoria Oregon & down the Oregon coast to the Redwoods, a real rodeo (Pendleton Ellensburg or Calgary, parks in Utah, Glacier NP, Yellowstone, Tetons, Minuteman Missle Museum jusr east of Wall SD, Mt Rushmore & the Badlands, Joshua Tree NP, Death Valley
Central
Corn Palace, any county fair or small town festival in Iowa (you meet the nicest people), Austin TX Riverwalk, Mackinac Island MI & the Mackinac Bridge, tour of Lambeau Field, Muhammad Ali Museum in Louisville, Martin Luther King Jr museum in Memphis, Houston Space Center,
East
Washington D.C., Arlington National Cemetery & Iwo Jima Memorial, all day bus tour of New York City, Niagara Falls, Andersonville National Historic Sight, Gettysburg, Hershey chocolate factory,
