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I have searched all over victory park and I do not see how to get the Ioann Island. Also no clue on how to get to the underwater kingdom.
I figured out underwater kingdom
You get to St. Ioann Island from Victory Park to its west. There's a boat in the southeast of Victory Park.
Figured them both out
I was some how missing a quest that basically caused my progression in the game to stop. Once I found the quest that I needed, I was able to get the correct dialog options to get to these missing places