We stayed for two days in the garage top parking lot. The parking lot is small and has only one entrance/exit, so it's only suitable for RVs that are 25' or less. There are larger lots behind the casino where some other RVers were staying. The easiest way to get to the lots is to drive south past the main casino entrance and turn right at the next entrance.
Because of bad weather we decided to moved down to the campground. It's not an actual campground just five full hook up sites. It's mainly for the convenience of the Game Hunting Lodge but it's also available for use by the general public. $25.00 a night or $15.00 for dumping and fresh water fill - pay at the lodge. It's located about a mile south of the casino. Look for the Hunting Lodge sign.