M.C.
Have you been to Northbrook Court? In the middle of the mall there is a play treehouse where the kids can play. It is gated, and a great way to burn a little energy on a bad weather day.
Also, check out Wagner Farm in Glenview. In the main barn, there are some toddler friendly activities like milking a pretend cow, collecting plastic chicken eggs etc. It is run by the Glenview Park District and free.
The Wilmette Library has a nice kids section on the second floor.
There is an indoor playroom in Skokie called The Exploratorium. I think it is closed for renovations right now, but should be openning back up soon. It is part of the Skokie Park District, so check their website for info.
Pump It Up in Glenview has pop in playtime on Tuesday and Wednesday. SOooo much fun!
Hope those ideas help out!