janfrederick said:
"A park can't be taken over unfriendly or otherwise unless it's for sale! I don't think Cedar Point was ever a publicly traded amusement park. "
Cedar Fair's predecessor company was publicly traded (at that time OTC rather than the NYSE as it is now), taken private by Cedar Fair LP, which later sold stock to the public.
Any company which has publicly traded stock can be victim to an unfriendly takeover, as long as the company trying to take over has the money and time to buy a controlling share of stock.