A friend and I are headed out to visit family in Seattle in May, and want to make as nice as possible road trip out of it both ways. Our time is flexible in the 5 day +/- target. I know it doesn't give us much time for long stops (I'd like to go trout fishing in a mountain stream!) but...are there some things along the way that we shouldn't miss? We'll probably go the "northern" route one way(as undefined as it is...looking at the Google map currently) , and "southern" route the other. We know of things like Badlands, MT. Rushmore, Corn Palace...would like to get into Yellowstone (which route??). Definitely appreciate your input. Thanks in advance. Z