How to get to the Cliff in Drawing with Nat: Dream Diary Version 0.2

I just finish the game, got all the form (thanks to some help), and almost got all the drawing. Yeah I just need #37 and according to the Wiki (yes, I just found out it have a wiki after the first post and the reply I got from my first post.) “37: Obtained by visiting the Cliff.” so can someone explain to how to get there and tell me the other codes for the Please. (if you want)