RONs - NJ -> OSH

I'm planning on taking my 4 & 6 year olds to their first Oshkosh.
However, I don't think they'll have the stamina or patience to make the
trip from my Central NJ location into OSH in one day. Probably would be
best to fly a few hours and then do some kid-friendly activity for the
rest of the day.

I'm looking for recommendations for stop-overs - the most likely route
will be over Reading, PA, Youngstown, OH, Ft. Wayne IN then around
Chicago to the south and west, though I might do a northerly route
through southern Ontario.

I know about Lancaster & Hershey, PA. Been there and would perfer to
find someplace further along the route.

Looking for some net.wisdom. Appreciate the help.

Mike Bullock
Warrior N227Z