Simple. All you do is: Get the diving suit then go to Capt'n salty and dive under the water and get his lucky trap. Then he'll give you a lobster. Go to the top of the lighthouse and go to the light and go to your inventory and click "Use" for the lobster.
Source(s): I've beat it
You get the bird egg then you get the piece of a bell
you get the lobster and hook it on the handle then turn the light at the bird.
To do this you must get the bird away, go to the secret room, take the bell thing, and put it on the bell.
Ring the school bell by shining the light on the bird
You have to get the lobster then turn the light on the lighthouse toward the clock and the bird (seagull) will fly away.
u have to give it the sardines
Ring the school bell.
check
The bell is on top of the school in big nate island
For the bell thingy on the school<3
so you can get the bell clapper.
Get the bell to ring.