Opened in 1976 by two local businessmen, Valleyfair is the largest amusement park in the Upper Midwest. The park features more than 75 rides and attractions on 90 acres of land, with coasters big enough to define the City skyline. With Soak City Waterpark, Planet Snoopy, Dinosaurs Alive!, thrilling coasters, food and games, Valleyfair encourages fun for the entire family from May through August.*Weekends in September and October, Valleyfair transforms into a Halloween-themed park. During the day, Planet Spooky is open for trick-or-treating, storytelling and activities with Snoopy and the rest of the Peanuts gang.