The girls are chatting on the playground exactly where you need to dig for the time capsule. They will only move when the school bell rings. You will need to find the missing bell clapper, then scare the seagull away that is stopping you from fixing the bell.
(see related question)
You first have to fix the broken bell and once it rings the girls leave! Oh by the way the capsule is buried under them!
You ring the bell
you give it to the dog when you get the girls out of the way.
Al the way 2 the right of the island
You have to get in detension
on the way top
in the detention room
Turn on the light house which will trigger the seagull to go away put the bell tong in the bell ring the bell the girls go away get the crackers put the crackers where the girls were the dog will come dig in that area and you finish big nate isaland
get the bell clapper
you have to look all the way to the right
There is a doorway to one in the school, but no way to enter that room.
You have to make the school bell ring so the girls will move out of the way, but, you have to beat the goose first. If you get to it, you have to ring it, and the girls will go away. Then, you have to get the shovel out on the rock at puffin point and dig for it.