I’d like to visit the park for the afternoon, how much does it cost? How much is the museum?

It is $5 parking and the museum is free.

When you enter the park go to the ranger station pay the $5 fee and you have access for the day to anywhere in fort Stevens state park. It will even get you into the state park further south near cannon beach. So if you want to venture on a hike to see a beautiful lighthouse you can do so.

$5 for a parking the museum is free.