On our list is Rushmore for a few hours during the day, then Wall drug. Then check out Devils tower. That night back to Rushmore.
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That's more driving than you think it is. I'd guess Wall Drug is at least 2 hours drive from Rushmore, mainly because of the narrow busy roads around Rushmore. And it's back east directly away from Devil's Tower. You may want to visit Wall Drugs when you pass it coming in from the east, the Interstate passes within a mile of it.
I'd schedule DTNM as a side trip when you leave the Black Hills area for Yellowstone.
It's hard to give suggestions about YNP and GTNP without more info from you. I suggest a search for yellowstone here in the forums it's one of the most frequent questions here and there are many threads describing it in great detail.
