1.) Jump on the red telephone booth on the second floor 2.) Jump up to a second platform, go straight and jump up and grab the ledge up to another platform (this one will look broken). 3.) Turn around and jump to the flower beds. There should be some openings behind those that lead to a room.
This is by memory so I hope I didn't make any mistakes. I beleive this room has the Ninja Hood and some other ninja stuff (katana, sushi). Naming it "ninja path" was not a good idea for a guide-maker to do, as anyone whose never found this room with all the ninja stuff wouldn't even know what he was talking about.
"You can touch me...but it'll cost you your life." -Mature