If you need help understanding about this friendly fellow here's the guide for you.
If you sometimes hear a bit of a stranger noise than a balloon in the sky it could be Gulliver. if you hear that strange noise pull out your slingshot and look up in the sky and wait till the sound gets closer. If you don't see him but you are hearing him run somewhere else and see if the sound gets closer.He will most likely be where you hear him shoot him down quickly,he flys pretty fast.(He flys in a spaceship)
When you shoot him down,go around your town looking for an item called the spaceship part.When you find it hold on to it till the next day.
The next day make sure you have the spaceship part in your pockets, then go look around the beach.You will see a spaceship and him lying on the shore.You'll have to talk to him a few times and then he will get up and greet you.He will also be wanting to head back home ,then he'll ask you if you can find his spaceship part.
Give the part to him he will thank you and give you one of the prizes listed below
Gulliver's Prizes -Moai Statue -Tribal Mask -Arc De Triomphe -Merlion -Pagoda -Plate Armor -Mermaid Statue -Mouth of Truth -Mannekin Pis -Tower of Pisa -Compass -Matryoshka -Chocolates
Hope this helps you out
By the way Gulliver is a special character that should appear once each month.