There are a couple of reasons for detailed planning.
Mrs. Chairman likes to know all of the particulars of where we are going, what's there, etc. I don't like to spend a whole lot of time looking. Mrs. Chairman doesn't like to spend a whole lot of time with me spending a whole lot of time looking. She and I simply want to get in the car and go from point 1 to point 2, no fuss no muss.
Second, it helps burn away the days with productive stuff between now and the time we actually leave.