The pilgrimage west into Wyoming to the 867-ft volcanic monolith made famous by Close Encounters. Long straights and big skies.
Easy but long. Interstate miles and open two-lane; wind and monotony are the real challenge, not the road itself.
Top off in Sundance (halfway). Hulett has one small pump. Ride ends 220 mi round trip — plan two fuel stops.
Ponderosa Cafe in Hulett is the biker stop. Devils Tower Trading Post at the base has burgers and ice cream.
Leave Sturgis at 7am. Beat the heat, beat the tour buses, and have the Tower to yourself.