What can I do at the Travel Agency?

Not book a ticket out of Yestertide, regrettably.

As no one seems to be there, you can pass the time looking at the decorations.

Have a closer look at the posters.

The LUXURY BOAT TOURS poster, specifically.

Notice a NAIL in the middle of it? What might that be for?

You have an item in your possession that has a tiny hole in the middle. Why not try and see if it fits?

Place the DISC from Gio's safe onto the poster.

Notice how some LETTERS show through the holes?

ROTATE the disc until you get a meaningful message.

Some messages may not be all that meaningful. If so, keep rotating.

"TENTH BRICK." What might that mean?

You've seen bricks everywhere. Are you supposed to start counting them now?

What about the number 10 as the number 10?

Have you looked everywhere for changes?

Why don't you go back to your room to think?