Cheapest way to travel the *DEEP* pacific ocean???

I currently live in Philadelphia, USA. Recently, some travelers I met, told me that there is a plane that goes from NYC -> San Fran for 70 bux. I've always wanted to live/travel the deep south pacific ocean..., such as the polynesia... in general. The only thing is..., Oceania is the most vast contient on earth, and picking one island to go to from ovber 7000-8000 miles away seems kinda silly to me. So what the CHEAPEST way to travel between the islands. Time is no object.

Sail Boat??
Freighter??

those seem the cheapest things i could think of..., but I've heard freighters are not cheap at all, but if u've heard different let me know.

PLus, I'd like to be able to live independantly of civilization. That means i only need a quiet album, with a very miniscule connection to the globe. Maybe just a place to buy bread or somthing, i dont need much or even that!!! especially if i can just fish..., let me know whats up...,

fyi - this is getting reposted in the new zealand and california forum.

thankyou