Have gone the backway, south on 191 to W. Yellowstone, west on 20 to Ashton, south on 32 &33 through Driggs (worth a stop) to 22 east to Jackson. There's a a long down hill grade going into Jackson. There is also a scenic loop before Ashton called the Mesa Falls Scenic Byway and a campground at the Falls if you're not in any hurry. Worth the detour.
This is the strangest life I've ever known - J. Morrison
2015 Airstream International Serenity 27FB with ProPride
2011 Ford F150 Lariat Ecoboost V6 Turbo Gasser