Steven is dissappointed to learn he is not spending school holidays in sunny Hawaii. Instead he is spending the holiday in Pulau Ubin together with his grandmother and his cousin Ah Boy. for the next six weeks. He will spends in a old kampong house surrounded by mosquitoes, trees and nothing else. Steven not sure how is he going to cope. The constant bullying and jibbing by Ah Boy does not noy make thing easier.

Steven and Ah Boy are bored. Ah Boy dares Steven to steal a huge jackfruit from Xiao Min's garden. Steven is reluctant initially but can't take Ah Boy's incessant taunts and accepts the dare. He manages to sneak in and grabs a huge jackfruit and he has difficulty moving it. Xiao Min catches them. She accuses the boys of stealing her pet rabbit as well. The boys deny it but Xiao Min doesn't believe them and threatens to report them to the police.

Steven doesn't understand why Xiaomin and Ah Boy don't get along. He tries to be peacemaker but make things worst when Ah Boy accidentally kicks a ball to Xiaomin's face. She keeps taunting Ah Boy into taking a dip in the sea. When Ah Boy loses his temper then Steven realises Ah Boy has phobia of water. Steven wants to help Ah Boy to overcome his fear. He bagins to seek help from books and even Teck Ko. Ah Boy refuses to admit his fear of water

Steven sets off with Ah Boy , Xiao Min and Teck Ko on his first nature trail. The rest are put off by Steven callous attitude towards nature - he litters everywhere, tramples over plants and even throw stones at a poor frog. Teck Ko tells Steven his actions will anger the Guardian Spirit of Ubin but Steven just laugh at the strory. Finally Ah Boy, Xiao Min and Teck Ko decide to teach Steven a lesson together.

Ah Ma wants the boys to take someof her vegetable to Uncle Salleh's house. Steven has no idea why Ah Boy disappears when Uncle Salleh's name was mentioned. He agrees to take it for Ah Ma. He steps in into Uncle Salleh house and looks around. Suddenly a loud voice booms out "what are you doing here?" Steven turns around and sees a mean-looking old man! Shocked, Steven drops all the vegetables and flees.

Steven is sick of Ah Ma's cooked food and wants a fast food instead. Ah Ma gets fed up and tells Steven to either eat or starve. Steven has no choice but to eat. His craving made him decides to sneak back to the mainland. Ah Boy and Xiao Min tag along. Steven feels at home once nestled in the city. He takes Ah Boy and Xiao Min around and boast how rich his parents are much to the disgust of Ah Boy and Xiao Min.

One day the boys overhear there is a rumour of sighting of tiger in Pulau Ubin and they ask Teck Ko to bring them on a tiger hunt but soon realised that the closest Teck Ko ever got to a tiger was in the a zoo. Ah Mah has been anxious for the boys to return home on time so she calmly and bravely protects the boys as they find their way home. Upon returning, Steven's father told him when he was young he disobeyed Ah Mah.

Ah Ma celebrates Steven and Ah Boy's birthdays. The boys talk about their birthday presents. Ah Boy wants motorbike that his father used to take him on rides when he was still alive and Steven wants a kiss from Xiao Min.Steven decides if Ah Boy misses his own father so much, he will get his father to buy Ah Boy's motorbike. That way, Ah Boy will hang out with Steven's father fixing the bike instead of playing with Xiaomin and him.

The boys discovered a strange secret - treasure map that supposedly leads to a million dollars. Teck Ko going around the island secretly hunting for the treasure. The boys convinced they are going to be rich began excavating Ah Ma bacxkyard! Greediness gets the better of them they began to quarrel and plan how they can each get the treasure for themselves. In the end the boys realised they are stronger when united.

Ah Ma receives a letter from the Land Office about resettlement and it's better for Ah Boy to live in Singapore. But Ah Boy is very upset and refuses. Steven, fights to convince Ah Ma not to give up their life on the island. Ah Ma finally agrees. Then Steven's father breaks the news that their family will be moving back when the school holiday ends. Steven realizes he has mixed feelings about leaving.