Assuming someone is a beginner, or intermediate level boater, how difficult is it to navigate around the coast of Oahu (out in the open ocean)? I’ve never driven a boat, but I would love to do this sometime.

I’m thinking I would have to take safety classes and get licensed, the obvious stuff. But is such a trip (navigating partly or wholly around Oahu) a dangerous trip? Would it be fun? Dangerous? A marathon? Has anyone done it?

Any real world experience with boating in Oahu and doing this kind of thing is appreciated.