As of October 19, 2013, it is not visible to the naked eye from Hawaii. That will probably change sometime by mid- to late-November.
However, there have been a couple of videos uploaded to YouTube, which have concluded that a bright object seen near Mars on October 16, 2013 was ISON. Unfortunately, it’s just a star called 37 Leo.
Let’s do some quick and easy research.
Here’s just one video:
If you look at the timestamp, it reads Wed Oct. 16 03:25:59 HST 2013.
Here’s a screenshot of the video, with the timestamp in the lower right corner.
Let’s input October 16, 2013, 03:25:59 HST for Hawaii into Stellarium.
Here’s what we get. ISON is in the center of the red bars.
Unfortunately, the bright object highlighted is 37 Leo.
Towards the middle of the video, we get a close up of the bright object.
For the benefit of the doubt, let’s superimpose what is available via Stellarium versus what is available in the video, using the timestamp of Oct 16, 2013, 07:40 UT, the same timestamp that was available on the spaceweather.com image seen within the YouTube video.
Regulus, Mars, and the bright object align, and again the bright object turns out to be 37 Leo.