In November, that will all change.įrom the new outdoor pool, to the interior walls, to the electrical wiring, it is literally a work in progress. Up to this point, out-of-towners who wanted to visit the wine country and do some gambling had to pick an off-site hotel property. On Wednesday, they took reporters on a tour. (KGO) - Graton Resort & Casino, just outside Rohnert Park in Sonoma County, is less than two months away from opening up a $175 million hotel addition to its 340,000 square-foot gambling floor. Graton Resort & Casino, just outside Rohnert Park in Sonoma county, is less than two months away from opening up a $175 million hotel addition to its 340 thousand sq.