Where do I book passage to Volcania?

Hint 1 of 11:

There's only one boat in this city.  It's at the wharf.

Hint 2 of 11:

If you haven't already done so, wake the people out of their trances.

Hint 3 of 11:

When you try to get on board the boat, you'll learn that you need a voucher
for travel.

Hint 4 of 11:

The mustard store sells travel vouchers.

Hint 5 of 11:

You will need three gold coins, but there's no way to make that money with
hard work.

Hint 6 of 11:

A bit of gambling is probably in order.