Why the hell would you want to be on a bus for that long? Just take your money and flush it down the toilet, then consider yourself a winner in that you didn't have to spend 6 hours on a bus getting to River Rock and back.
Id rather book a trip to Reno
I am sure there is a bus available. However it is a pretty modest casino and may not be worth the travel time.
Take a plane to Vegas instead.
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