You're right, that section is in Lake Bluff. I just hate riding on MUPs, and I hate the idea of people trying to force bicycles off of perfectly good roads onto MUPs, that I would never comply with that law.
I think I got off of Sheridan in Lake Forest because I wanted to bike closer to the shoreline. Many of the residential streets have signs that instruct bicyclists to ride on the sidewalk in that area, if I remember correctly.
And there are also some areas in Ravina that prohibit bicycles as well. I made a point of riding on those roads as well.