What can I do in the Maritime Museum?

You can look at the exhibits, of course.

Have you gone through the catacombs, yet?

Come back when you have.

Have you found the boat in the cove?

Luckily there's a replica boat in the museum, complete with rudder.

Look closely at the RUDDER.

Do you have a tool to remove it?

Sometimes you can REPURPOSE unexpected objects to get the job done.

Something with the right-sized opening in it might be just the ticket.

If you haven't found an "8" yet, go look at the steps that lead down to the island's Welcome Sign.

Use the 8 on the bolt that's holding the rudder in place.

Tap the rudder to loosen it. Take the note hidden behind it while you're at it.