You find that the key has the image of a monkey on it. Number 52. Off you go to find this room.
(A bit later)
You find it! You unlock the room, and open the door. The room's contents surprise you. It looked exactly like a typical monkey enclosure at a zoo! There were trees, grass and vines. You guessed that you had to sleep in the trees... But really, how did they get all of this in one room?! This place is stranger than you think...
On the ground is a complimentary banana. You find this place very authentic.
You could take a nap in the trees, or eat the banana... Among other things.