I park at Beau Rivage as well. It's free. I will warn you that their walkover isn't connected to MGM Park although it looks like it is. So, you have to walk through Beau Rivage and go out the front door to get to the walkway. It's not terrible- but it's a little confusing. Also, nice, clean bathrooms at Beau Rivage as well. And they have some places to eat after the game as well.