You need to go to Tiana's house first and ask her about the harbour.
Then you head to the Don of the casino (you'll need a VIP pass - just spend 25000 in chips (buy / sell repeatedly)
Then you can go to the docks and travel
thank you so much! the games great btw, but are the battle against the boss monster on the islands not possible to get an actual victory over or am i doing something wrong?
They are beatable. But your stats need to be quite high to do so.
Since it's mostly optional content, you need to have grinded out stats a bit more than for normal battles.
Things will probably be rebalanced though...
