Amusement parks in the company 's northern region include two in Ohio : Cedar Point , consistently voted " Best Amusement Park in the World " in Amusement Today polls and Kings Island ; as well as Canada 's Wonderland , near Toronto ; Dorney Park , PA ; Valleyfair , MN ; and Michigan 's Adventure , MI . In the southern region are Kings Dominion , VA ; Carowinds , NC ; and Worlds of Fun , MO . Western parks in California include : Knott 's Berry Farm ; Great America ; and Gilroy Gardens , which is managed under contract .