If you're not feeling lucky and don't want to spend a few bucks for their sites ($24 in May '18), you can park for free in the parking lots. One popular area is with the tractor trailers, but personally I don't like listening to them all night, so we parked in a general parking area near the front campground but not the general parking area. Nothing out front is level so bring boards or plan to tip a bit.
Inside the casino are lots of slots as well as some table games. People seemed happy as they played.