Hmmm... I recently did a in-city half century ride that had all of the above including a steep descent into a cul-de-sac, with arrows pointing right back up the hill. But that may have been very peculiar to that course.
I would consider, however, trying to plan secondary roads and minimize high traffic roads.
One thing. Significant GRAVEL. Not a huge problem, but it needs to be publicized if it is included in your route. Also consider gravel and debris on fast hard corners. Road & shoulder condition in general?
I'm happy enough with pancake flat rides, but a lot of people seem to like to add a few hills in the longer rides. Maybe not excessive non-stop climbing, or excessively steep hills (unless that is the goal).