Arguably, the best campground near Indy is White River in Cicero. Old Mill Run, Thorntown, is also, IMO, quite good. Sugar Creek is OK. The KOA in Greenfield will do if you want to be on that side of town - not really my favorite, but ok for short stay. Indy fairgrounds is alright, but we are not comfortable overnight in that part of town - others feel differently. Have a pleasant stay in Indianapolis.