Go to http://www.themagnificentmile.com/ to see where it is, get a list of shops and restaurants, see what’s happening/special events, etc.
A Fave Mag Mile Activity:
If I have time, I love to take the elevator up to the Signature Lounge on the 96th floor of the John Hancock building for a cocktail or soda (open 11am – 12:30 weekdays/1:30am weekends) It’s free to ride up the elevators that are dedicated to the restaurant and worth every penny of the slightly elevated price of your drink to enjoy it in front of floor to ceiling windows getting a bird’s-eye view of the city.
(Note: The building is located at 875 North Michigan Avenue – However, the elvator to get to the restaurant/bar is located on the south side of the building) http://www.signatureroom.com/