JAY.
Steepest terrain, most powder, most snow in general, most trees, they keep it 'ardcore. Jay is the closest thing to the West out East. It reminds me of Baker.
Best park -- Avila, St. Sauveur in Quebec. I don't go to the US for park so there's probably others.
Best party -- Tremblant. When the snow is good, Tremblant rocks. Their park is world-class too, but what really makes Tremblant shine is everything you do AFTER skiing.