2017 solar eclipse - IdahoTweet
The center line intersects highway 15 near to Roberts, which is between Idaho Falls and Dubois.
Idaho Falls, Rigby, Rexburg, Menan, Sugar City and Ashton are all on a direct road to West Yellowston on the edges of Yellowstone National Park
Driggs, Victor, Tetonia are on direct roads to both Yellowstone National Park and the Grand Teton National Park and John D Rockefeller Jr National Parkway.
The eclipse and Yellowstone sounds like a great combination to me.