J.V.
We went to the park last May and we did enjoy it but it's NOTHING like the STL Zoo. Our zoo is a million times better. Lincoln Park Zoo is very small and nestled in the park but if you go past the park there is another area for younger children that has farm animals and baby animals that you can touch and get very close to. They have some exhibits with farm facts. My daugther just loved this part. But it may not interest an 11 year old.
I love Shed Aquarium, it is just wonderful and beautiful and very educational. I always want to go everytime I visit Chicago.
The Natual Sciences museum is really neat and they have a lot of fossils which are fun to see.
If you like shopping, there is a seven story mall downtown that is nice, parking is crazy expensive so take a taxi.