You use a lobster (!) to turn the crank on the lighthouse light, which will scare the seagull from the school's bell tower.
To get the lobster, catch the photo blowing next to the lighthouse, and take it to the photo shop. The owner will swap you some diving gear, which you can use next to the lighthouse. Dive and recover Cap'n Salty's lost lobster trap and he will give you a lobster and his jet ski keys (use them once you look through the artist's telescope).
Turn the light to scare the seagull, and then you can fix the bell.
(see related question)
On Big Nate Island, you use a lobster (no kidding) to turn the lighthouse crank. (see the related question below)
You will have to swim for it : the lighthouse is on Big Nate Island, not Counterfeit Island.
Once. But you have to be at the lighthouse crank. Use the lobster and it will automatically complete the process.
It is on top of the lighthouse.
Use a lobster to grip the crank on the lighthouse light. (see related question)
Use the lobster to crank the lighthouse light. Turning it left will scare the seagull from the school's bell tower.
At Big Nate Island. You have to keep going right on the island.
There is a lighthouse on Big Nate and Vampire Curse Island.
You use the lobster as "pliers" to turn the crank on the lighthouse, so that the light scares away the seagull from the school bell tower.
on top of the lighthouse
The photo is blowing in the wind near the lighthouse (far right on the island).
The lobster can turn the crank on the light at the top of the lighthouse, scaring away the seagull from the school bell tower.