Just move as fast as you can, by aiming the mouse cursor at the upper right. Click to jump the obstacles, and slow down to avoid the dropped eggs. As long as you move fast, you should beat Nate even if you hit a few obstacles.
You will have to beat it
Even if you have the jetski key and know where the map is (under the rock on Seal-Saw Island), you still must look through the telecope at the lighthouse, because that's how you are supposed to find out where it is. (see related question)
there should be a youtube on big nate island. go to youtube and type down poptropica big nate island part 1 and go to the name secretscp. (hes awesome) there is a girl named graser10 but she HATES him. :)
if you don't get the keys you can't beat nate to get the map for the school.
The old sailor (Cap'n Salty) will give you the keys to his jetski, and a lobster from the trap. You use the lobster as "pliers" to turn the lighthouse light and scare the seagull away from the school bell tower. You look through the lighthouse telescope and see the paper on the seal island. Race Nate on the jetski to get the paper from the island. (see related questions)
The peanut butter cracker on big Nate island is given to you by Nate.He gives it to you after you beat his game of hangman in the tree house or playground.
Cap'n Salty is at the lighthouse, bemoaning the loss of his best lobster trap. If you recover it for him, he will give you the jetski keys. (see related question)
beat big nate!
You do not play as Big Nate. He accompanies you around most of the island, and races you on the jet skis.
You can't play "as" Nate, but everywhere you go on the island, he tags along.
There is no Duke among the characters of Big Nate island.
You have to get thescuba gear from the picture guy. Then you go to the light house and dive into the water. Get the crab trap and the light house keeper will give you a lobster and the keys.