Go to the sewer. You have to figure out the maze. You get a golden egg. Get out of the sewer. Jump on a building. Jump on the wires alot so you could get to the last building. Go on the green vine. You will see a purple giant. You give him the egg. He will let you pass. Get the water bucket and the jet pack. You fly to the exit. You will land on the water tower. Get the flag. It will be next to you. You fly to the 8-bit place. You give the bucket and the flag to the guys. Then a boat will come. Go to the boat. Talk to the guy. He will give you the medal.
Early Poptropica Walkthrough
Video walkthrough