I don’t believe this is going to be a fixed list. Whether or not the gate is manned (no sexism intended) will probably vary with time and day, and will depend on the expected level of business and available staff. A gatekeeper won’t add a whole lot to security. Even at the busiest parks there will be no gatekeeper at night, and many parks allow day access so there is no way to exclude people.
Obviously larger and busier parks will have more staff, and remote ones fewer.
Credit:stackoverflow.com‘