From Atlanta to Vegas to SF, up the coast to Washington, then back east though the middle of the country and back to Atlanta, going through Grand canyon, petrified forest, Yosemite, Shasta, redwood forest, Columbia River gorge, Yellowstone, Badlands, and car camping at some state parks on the way. I think it was 27 states total, 99.9% self driving and zero planning on my part.

Oh, and only one hotel night on the way west, and another hotel night heading back east. The only reason we did that was for showers basically. (We stayed with friends in Oregon for a week)