Saw this thread. Just wanted to add that you can take a free shuttle bus from very near the Fairmont Hotel. These buses load up in two places:
- Upper Randolph St. approx at Columbus
- Lower-Lower Randolph approx at Columbus
They are intended for people who are parked at either Millennium Garage or Monroe St. Garage, but really, anyone can take these buses. They take a "secret" route to Soldier Field as well, alongside the railroad tracks in a special bus lane.