Zoom in on the Diamond City map by pressing Plus to find these:

Tourist Info Island
Location: Top right corner
You can hear floating voices that are supposed to be calming.

Tourist Info
Location: Top left corner
Says that you can see tomorrow from there.

Form Thoughts
Location: Bottom left
Lists the form baton basics learned at the beginning of the game.

Town Bulletin Board
Location: Bottom Middle
Random posts from characters. The characters perform little animations. For example, with Wario his pants fall down.