If it was being given to me: Central Park
If I had to pay for it myself: Lincoln Park.
Something at North & Astor or North & Dearborn, in front of the Hancock Center in this pic:
"Architecture is the art of balancing values: economic, aesthetic, public, private. It always involves compromise, and few architects would deny that the client's desires take precedence. But the best architects understand that they also have an obligation to the public welfare, no matter who is paying their bills. That often means investing time in educating clients rather than simply acceding to their desires."
- Nicolai Ouroussoff, New York Times