I was going to say Karst farm park too, but I haven't been there to say how it is. It is right by the fairgrounds (County fair is through Sunday I think too).
There is also Bryan Park Pool or if you want something indoors there is the Wonderlab downtown. I don't know how old your LO is but when I worked Parks and Rec daycamp (at Karst) the kids always had a blast there!
Wonder lab looks cool. I will be with my cousin that is 7 so I think she will like that. My DD is almost 8 months so anything to look at that is colorfull with be fun for her.
Re: Bloomington Ladies another ?