Dr. Courtney said:
Do I have this right? You're going all the way to Hawaii for a grad school interview, and you're not speaking with any faculty members whose research interests you? Or is a rep from U of H coming to you?
If you're going to Hawaii, identify and try and meet with faculty whose research interests you.
If a rep from U of H is coming to you, identify faculty whose research interests you, read some of their papers, and ask the rep you meet with what they know of their colleagues' work and to assess the odds of those faculty remaining at the U of H long enough for you to complete a PhD with them. Their answers may or may not be accurate, but your question shows you've done your homework, and then you might contact these faculty directly about their work (email, skype, etc.) if mutual interest remains.