I've been on the boat from which the people were filming that disaster. But set aside the duck boat thing.
On our boat (years before) was a magic show and dinner, and a "river boat" ride around the lake. Only, the magic show was actually a family comedy show, where the guys tricks never worked, and kids just thought it was hysterical. I've never seen my kids laugh harder and longer than that night. They begged me to buy the guy's videos. My son was falling off of his chair, and couldn't breathe, he was laughing so hard. That's a good memory.
Silver Dollar City amusement park...and a hundred other family oriented shows and go karts and water parks and other family fun things to do.
Heck, we had a cheap dinner at the Golden Corral, and saw a hilarious variety show...again, at the Golden Corral. We had a lot of mouths to feed the first night there, most of them kids, and who would've thought the Golden Corral would be one of the better memories.
It is VERY touristy, so go into it knowing that, but I was also pleasantly surprised.