What do you want to know? Yes it does exist as Ive known some peeps who trained there. The biggest problem is there are like NO jobs on the islands. Kaiser is very much impacted there and UH is overloaded. Even if you did land a job, the pay is utter hog piss. So you are left with scrambling for a fellowship position and/or job back on the mainland with pretty much no connections, not an enviable position. In addition, you get endless shiat for having trained there.
My advice: save Hawaii for later in your career. Go there on vacation. Find a group with 3 months of vacation a year and spend it there. But dont train there.