In some parks like Hershey Park and Busch Gardens Williamsburg, when they open only around half of the park is accessible for the first half hour. Is it the same for the normal park in Cedar Point?

Cedar Point is fully open and running at 9 am (only a few rides are able to be ridden) for people that stay at the Cedar Point hotels. (Early admission for staying at Cedar point hotels) The park is open to the public at 10am until close

No. The park is fully open from when it is open to close (some occasions)

Cedar point opens at 10 am and Ceador shores opens at 10:15 am for restrooms and those who have VIP pass.At 11:00 am general public.

No.