Binoculars is an item on Ghost Story Island. It's required to see the Woman in the Window, the other being the Violin and Music

When the Magistrate takes the camper away, he leaves the binoculars. Take and use those binoculars. After you played the woman's favorite song on the violin, use the binoculars and you will see her from the window. She will summon you to come up to her, your Poptropican says "She wants me to come to her, do I dare?"