I was able to visit the Museum of Science and Industry there. This is one of the greatest museums in the country. I have visited museums in San Diego, Los Angeles, and Phoenix, and nothing compares to Chicago's. I also was able to see the Brookfield Zoo, a large and fascinating zoo. Dining in Chicago truly outweighs many other cities. And the sites, the architecture of the buildings downtown, and the ethnic background of the people in Chicago is wonderful.
Quick Tips:
ATA airlines is a wonderful airline to get a fantastic price in order to fly to Chicago. They have recently gone through many changes, one being joining the Southwest Airlines family, but they remain one of the best and least expensive airlines I have known.
Best Way To Get Around:
The best way to get around Chicago is to take the L. I am in a scooter (motorized wheelchair) and even at that the L is very amenable for travel throughout the city and to see the sites as you are going from place to place. There is nothing like it to get from place to place while sightseeing in Chicago.