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no hotel, but shuttles at partner hotels
http://www.paysbig.com/pdf/map.pdf
stayed at Pfister, and Hyatt - both are very nice
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Those 10 are all downtown and should be fairly nice places although I'd guess some are pretty expensive. Other than those I can't really think of any hotels near the casino.
Here's the page with the details about "stay and play".
http://www.paysbig.com/visitor/stay_play.htm