I was thinking of in the undrgroundd lake that the fishing shop sells sea lures and rod, and also sells a fishing boat, or you could rent one from a rental place (the shop, you get a npc for forever, rental, only once,) that you could go out away from land, to catch bigger, harder fish

it will cost alot of money to get all the stuff basically, but rental will cost about ...probably 15 gralat per time