Whatever direction you are traveling from, Kansas has a lot to offer!
If driving by car, you can stop by any number of sites like the Dole Institute in Lawrence, the Wizard of Oz museum in Wamego, the National WWI Memorial and Museum in Kansas City (technically in Missouri), the Kansas Merci Boxcar in Hays, or any number of the 329 "Roadside Attractions" listed on the official Kansas Tourism webpage.
This and so much more including a free travel map and guide can be found at https://www.travelks.com/