Most people clear out around 5. Since it's open till 9, that's like the best time to be there. The lines are short, sometimes nonexistent, and the slopes are relatively clear of newbies. It gets really busy around noon. You don't even want to ski. Lines are about a 15-45 minute wait and the slopes are packed full to the point people are literally running into each other for lack of space. It actually gets kind of scary. If you're advanced, like double black diamond advanced, expect little to no wait at any time. Most of the people out there are newbies to intermediates.
Fun but too many people learning. So many people. If your gonna rent then have a good time standing in line for a hour or two. In lift lines people are not organized. Way to many beginners. Wait till holidays are over. Overall little amount of snow with a large amount of people.