I need to know a great vacation spot on the east coast, or midwest with three children. Please Help?

We are already going to be in Tennessee and are looking for a new spot to vacation for a few days on the east coast or in the midwest. Not Myrtle Beach of Va Beach we already did those. Preferrably directly east of Tennessee Kentucky Border, and North. Nothing too far south since we are from Ohio. We have three children ages 12, 10, and 3. Thank You. Also specific resorts would be awesome.