If you're thinking of going to Vegas with children, I'd check out Excalibur casino, which is child-friendly and right on the Strip (where all the major casinos are located).
It's as close to a "family" casino as you can get (with the possible exception of Circus Circus which is also on the Strip, but much farther down where the older - and grottier - casinos are located). You can walk up and down the Strip from that location, it's minutes from the airport, and you're right in the heart of the action. Right now they're virtually giving the rooms away.
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