Things to consider/ Logistics:

Time line: August 31, 2016-September 9, 2016 --> 7 days
Transportation: Rent a car in NY, then fly back from Seattle
Number of Drivers: 2
Length of driving time: Ideally, drive between 8-10 hours a day.
Length of time for stops: Take at least 2 full days, each in one place [possibly Chicago and one full day in a national park (haven't settled on one, yet)]. I'm considering either the Badlands or Yellowstone. Any suggestions?
For the rest of the 5 days that involve mostly driving, we would like to stop in Cleveland, Chicago (full day), (what are some cool places to visit in between?) Badlands, South Dakota (possibly full day) or Yellowstone, Wyoming (possibly full day), Montana (any suggestions?), and finally, Seattle, Washington (suggestions?).

I hope to hear your thoughts soon. Any advice/tips/recommendations are welcome.