Young forum members may not realize why Kodachrome is different than other color films. It is actually a black and white film with no color dies built in - the color is added during the processing stage. That is also why it is more stable than all the earlier generation color film. I work at a pro lab and we often scan people's old slides - the kodachromes look great while the ektachromes are all red (or some other color). BTW the newer films no longer have this problem - especially Fujichrome slide film.
That is also why no one with remaining Kodachrome will ever be able to process it. The machinery is huge, you need a certified chemist on site, and the chemicals are so toxic they are illegal in many areas. My lab had to ship ours out to Los Angeles because it was illegal in our county in southern Arizona. After they stopped doing it and Dwayne's in Kansas was the last place, we just gave people Dwayne's contact info. Now they are done too.
Back to the original topic, I would shoot one shot at each of America's 36 top national parks. A shot of the Grand Canyon, as shot of Yosemite Valley, a shot of a redwood at Sequoia, etc.