Lake Forest City organized a Snow Fest day for everyone where they had 2 snow play areas (free) and 1 snow slide area (purchase ticket in advance for $7.00/person) with a small stage where they play music. Last time I took William to the Winter Fest at the Discovery Cube and he totally loved it so we decided to take him to this event.
Luckily this time the line was not that long; and William got to play 3 times. I think it was only 5 or 7 minutes per session. He behaved really good while waiting in line: he patiently waited without running around.