We then will be going to the Mammoth Springs in Yellowstone. We are leaving Chicago on 8/1 stay the night somewhere along the way ?Lacrosse?, then the next day arrive in Rapid City are and stay around there until 8/4 and drive towards yellowstone. Our hotel in Mammoth is on 8/5 so I thought we would drive somewthere a 2 hours away of so and stay the night then leave in the AM on the 5th and explore.
So my question is do we go to Cody and enter the east entrance or though Billings and enter in the north entrance. Not sure which is a better drive.