I know it said that it is closing at 8 pm, but what if people wants to stay to do some night fishing?

The campground is closed due to drain field issues. Has been closed for two years. The park itself is still open, but they kick everyone out at dusk. No exceptions

Down the road a mile to the Illahee dock for night fishing

Like Jeff said it's been closed to camping for sometime because of the drain feild. And it's locked up in the evening.

Ask the Park Ranger. They do have camping.