Just so you know, many of the snow schools in the GTA will be having their instructor training weekend at MSLM this weekend, so it might be crowded. (Yes, I'm one of those instructors.) There are usually a couple of instructor evaluation courses going on as well, both on the snowboard and ski sides, adding to the crowds.
I'm not trying to dissuade you, just want to make you aware.
And they've already got one park open!! Nice...
Finally, usually the Moonstone side isn't open yet, so make sure you got to the Mount St. Louis side.