You don't. Give the trap to the old man (Cap'n Salty) and he will give you a lobster and the keys to his jet ski.
There is no net on Big Nate island. There is a lobster trap, and you can recover it for Cap'n Salty. Grab the photo blowing around by the lighthouse and take it to the Say Cheese photo shop. The owner will give you some scuba gear to dive for the trap.
You can't get a wrench to turn the lighthouse crank. Try using a lobster. Catch the floating photo by the side of the lighthouse, and take it to Say Cheese, where the owner will swap you for scuba gear. Dive at Puffin Point to recover Cap'n Salty's lost lobster trap, and he will give you a lobster.
The lighthouse light can be turned if you can grip it. The item you use is actually the lobster you get from Cap'n Salty's missing lobster trap. To get diving gear, catch the photo blowing around near the lighthouse and take it to the Say Cheese shop. With the scuba gear you get, you can dive to the right of the lighthouse and recover the lobster trap.
Take it to the owner of the Say Cheese photo shop, and he will trade you some diving gear for it. Use the diving gear to recover the lobster trap at the lighthouse. (see related question)
You can get a lobster by recovering Cap'n Salty's lost lobster trap at Puffin Point. Catch the photo blowing in the wind by the lighthouse, and swap it for scuba gear at the Say Cheese photo shop. Use the gear to dive for the lobster trap. If you bring it up, Cap'n Salty will give you a lobster and the keys to his jet ski.
you go to bignate island and go in the saycheese building the guy will say he needs a picture and after that go to the end of the island and you and you do up the wire things and you will see a paper flying in air, jump on the picture and you got it then take it to the say cheese house enter it and go to the guy again and trade the picture you have a scuba gear go to the end and go under the sea and go deep and you will see a cage with a red thing in it take it and take it and go up the sea and you will return it to captain salty he will give you a lobster and keys yay you did it
The old sailor (Cap'n Salty) has lost his favorite lobster trap at Puffin Point, past the lighthouse. If you recover it for him, he will give you a lobster, and the keys to the jet skis for you and Nate. To get the diving suit, catch the photo blowing in the wind by the lighthouse, and take it to the Say Cheese photo shop. The owner will give you his scuba gear for it. Put it on and dive past the bubbles to retrieve the trap.
Catch the old photo blowing in the wind by the lighthouse,and take it to the Say Cheese shop. The owner will give you some diving gear for it. Return to Puffin Point and dive for Cap'n Salty's lost lobster trap. He will give you a lobster and the jet ski keys. (Swim right, then go down to get the trap. You cannot run out of air on the way up.)
Go to the lighthouse where there is an old photo blowing in the wind. Take it to the Say Cheese camera shop and the owner will give you a scuba diving suit for it. Go to the lighthouse and dive for Cap'n Salty's lost lobster trap.
Catch the old photo blowing in the air by the lighthouse and take it to the Say Cheese photo shop, where the owner will trade you some diving gear. Take it to the water by the lighthouse and dive to recover Cap'n Salty's lost lobster trap. Go across, avoiding the bubbles, then down to reach the trap. Cap'n Salty will give you a lobster and let you use the keys to his jetski.
Because of the way Big Nate Island is structured, you cannot take shortcuts (even if you know what information is needed). If you are uncertain of the proper order of the solution, see the related question.
its under the rock when you go and take the ski boat