Lewis & Clark Trail thru SD, ND & MT

Nine days in my little camper... Week of July 4th & weekends before & after.
I'm planning a trip to follow the middle section of the Lewis & Clark Trail through Nebraska, South Dakota, North Dakota and Montana. I'd also like to swing down into Wyoming (Yellowstone NP) on the return leg. Right now plans are to stop at Lewis & Clark Interpretive Centers along the way and also finding a bicycle path/trail daily for a 1-2 hour ride. Would like to stay 1-2 nights in SD, ND, MT & WY before heading back to Missouri.
Anyone have any suggestions of what not to miss along the way? Been to the Bad Lands, Black Hills & Mt Rushmore already. Also been to western Montana. Mainly looking for things along the Missouri & Yellowstone rivers.
All suggestions welcome. Thanks.
I'm planning a trip to follow the middle section of the Lewis & Clark Trail through Nebraska, South Dakota, North Dakota and Montana. I'd also like to swing down into Wyoming (Yellowstone NP) on the return leg. Right now plans are to stop at Lewis & Clark Interpretive Centers along the way and also finding a bicycle path/trail daily for a 1-2 hour ride. Would like to stay 1-2 nights in SD, ND, MT & WY before heading back to Missouri.
Anyone have any suggestions of what not to miss along the way? Been to the Bad Lands, Black Hills & Mt Rushmore already. Also been to western Montana. Mainly looking for things along the Missouri & Yellowstone rivers.
All suggestions welcome. Thanks.