Melee Island is quite big.
Why don't you explore it?
How should I navigate Melee Island?
Some parts of it seem like a three-ring circus.
Quite literally, actually.
On the general map of Melee Island, go to the pink light (labeled "Clearing" or "Circus"). It's near the middle of the map.
Have you visited the Fettuccini Brothers?
They're inside the circus tent.
Unfortunately, they're arguing too much to pay attention to Guybrush.
Anything he says, though, will get their attention.
Apparently, they need to blast someone out of their cannon.
You should volunteer.
They're willing to pay 478 pieces of eight!
But you need a helmet.
You can't talk them out of requiring one.
They want you to have a helmet...
Or at least a make-shift one.
Where can I get a helmet?
Once you have a helmet, you have to let them know you got one.
Give them your "helmet," to clinch the act and the money.