if you would consider going up to Quebec, then I'd definitely recomend going to Le Massif de Chalevoix. It has a fraction of the people Mont St. Anne has, and better snow only 45 mins away from there. Although if you want a trick park, then go to Mont St. Anne. but ontario mountains (lol mountains) in april is risky
I didn't realize that the mountains are so much larger in Quebec compared to Ontario. Tremblant, St. Anne and Le Massif de Chalevoix are all quite large, by my standards, they appear to be first rate resorts as well.