My wife and I might hook up with you for part of it if we're home as Yellowstone is on our radar for next year anyways. There is some chance we'll be visiting/riding a big rally in Brazil at that same time so...

FWIW, my wife would vehemently disagree about the Devil's Tower part as she loves the hike. But to each their own. Spearfish Canyon, Needles Highway, Old Hill City Road are the not to miss Black Hills riding for us. Have yet to ride Iron Mountain.