If you do make the trip, perhaps combine it with some Halloween adventures. There are many available, depending upon the ages of your children.
E.g., Kirtland's Lake Metroparks Farmpark (reservations go quickly), Cedar Point HalloWeekends, and The Henry Ford's old-fashioned Halloween, complete with a headless horseman (again, reservations go quickly, especially if you book the dinner option).
Here are other attractions in northern Ohio outside of Cleveland (check "Things to Do" there). Ohio Amish Country might fascinate your daughter and is especially beautiful in early October.
In Cleveland, check out the Rock and Roll Hall of Fame and Museum, the Cleveland Museum of Art, the West Side Market, PlayhouseSquare, and the Cleveland Orchestra at Severance Hall.
Severance Hall, Cleveland's Taj Mahal (built by one of the Standard Oil Trust heirs in memory of his wife) often is considered the most beautiful concert hall in the U.S. and it has many events, most featuring the world-renown Cleveland Orchestra.
The Cleveland Museum of Art is one of the best in the U.S. even though admission to its general galleries is free. Its digital attractions currently are the best of any U.S. art museum (check out Gallery One, Studio Play and ArtLens).
PlayhouseSquare has some of the best U.S. performance spaces and a large schedule of events.
Lake View Cemetery features one of the best remaining Tiffany interiors at its Wade Chapel, the magnificent Garfield Monument, the largest presidential monument in the U.S., and the family grave site of John D. Rockefeller. It's also an arboretum and beautiful during Leaf Turn.
Other great Leaf Turn destinations are Holden Arboretum, one of the largest and best in the U.S., and Cuyahoga Valley National Park. The CVNP is especially great for biking.
Kalahari is one of the largest indoor waterparks in the U.S., but I won't offer an opinion as I've never visited it.
Also in Sandusky is Ghostly Manor. Perhaps check it out on the web or TA.