The crustacean in the lobster trap is a lobster.
(see the related questions)
You have to get the crab pot for the sailer then he will give you the containtens [a crab] you can use the crab as a crank.
you use it to go scuba diveing for some kind of crab trap thing thats in the water (you will get to it sometime)
It is a lobster, not a crab. Use the lobster like pliers to turn the lighthouse light around. This will scare away the seagull on top of the school bell tower. (see related question)
On Big Nate Island, you use a lobster (no kidding) to turn the lighthouse crank. (see the related question below)
You use it on Big Nate Island by the lighthouse.
you use it to turn the light on the lighthouse
you use the stink bomb wow
The only known use of the cement is to climb the scaffold.
You use it to get the dog to dig
You go to the harbour and click on the jet skies. after that you will compete with Nate to the island with the map.
You don't use the boat on Big Nate island. When you have recovered Cap'n Salty's lost lobster trap, he will give you the keys to his jet ski. Look through the telescope atop the lighthouse to see where you are headed. You also have to outrace Nate.
you use the seals to weigh it out to one side