Do you mean getting out alone or with the kids??
Alone, Barnes and Noble is nice. Sit there, read, have some coffee. I personally go to a movie once a month or so all by myself and it is a great escape.
With the kids...Racine Gymnastics (on Golf Ave) as open tot gym Monday and Fridays 10am-noon. And I think they have open gym for bigger kids at different times. Its great!! The kids run wild and have tons of fun - gets out a lot of energy.
The library also have different events like story time and such. Never tried that one yet tho.
Sometimes I will take my 2 year old and just walk around the mall. Then at the end of the trip she gets to go on a couple of the rides by JcPenneys.