Keep in mind the distances involved, but you could do:
- Down Rt 90, up to Little Bighorn - 2.5 hours from Gillette
- across to Red Lodge Montana and down into Yellowstone - another couple hours (not sure on this one, but amazing ride)
- Out West entrance of Yellowstone into Cody - museum alone is at least a day
- Back through Thermopolis, across the bighorns and back down 90 to Gillette
