What is the fastest way to get money in Coral Island?

I'm curious, what would you say is the quickest method to acquire wealth in Coral Island? Is it through fishing? Or perhaps, there's a lucrative business opportunity I'm unaware of? Could mining for precious resources be the key? Or does the island offer some unique gambling or investment opportunities that promise quick returns? I'm eager to know what strategies you might recommend to rapidly accumulate funds in this exotic locale.