Someone previously mentioned Aloha knitters we actually try to meet up once a week. There are seperate groups of ladies though that meet on one side and then down in honolulu (that's the one I go to)
And Ben franklins, craft supply and walmart were already mentioned.
There are a couple others too, I'll post a link to the site that lists all of them and the addy's for them.http://www.dailyknitter.com/shopsHI.html
There is not really a large amount of people that I have found to knit with. But the few that I have found are wonderful people.
And as time goes by knitting may catch on even more here, who knows. But good luck!
Oh P.S. Crocheting seems to be more popular here, very much so.