Given that people will be arriving on Friday. Maybe a nice lunch late breakfast, would be the place to start on Saturday. Then we could plan when to visit My. Rushmore, etc. Get the traveling companions involved. Etc. There is a lot of space out here and two lane roads. Getting from place to place takes a bit if time. The scenary is good. Just an idea. I am afraid that we will waste a day if we wait until Saturday night.
That might work better.
How far in advance do you think we need to finalize this/make reservations?