All right, the mermaid show is free, but awful. It's a girl in a sparkly, spandex tail, noseplugs, goggles, and flesh-colored cloth over her arms and cleavage. The illusion that it COULD be a mermaid is dead. All the girl does is hang by the bottom, sucking on an oxygen hose while waving to the kids for 10 minutes before getting out of the water.
The best thing this place has going for it is the mutant-sized Bass Pro Shop you can enter into from the casino, near the aquarium. It's like a Natural History Museum with a gift shop loaded with camping equipment, fishing poles, guns, and survival gear.
There's nothing really noteworthy about the casino itself. It's just another place to pump spare change.