It appears to me that there is the usual crowd of aspiring filmmakers but not a ton of filmmaking at the national festival level. If you want to make a living at it, that is. We have a mainland friend who's in the business, and she thinks Hawaii has a reasonably good reputation in some areas, although not-so-much in mainstream films other than as a location.
Louis Vuitton sponsors an annual International Film Festival on Oahu each October, and Maui has a nice festival in June. We've seen several documentaries and one dramatic short ("The Ride," about time-shifting with Duke Kahanamoku) as part of prior years' Maui festivals. There are occasional local contests with open entries -- a few years ago there was an open call for films to promote the preservation of Ahihi-Kina'u Natural Area Preserve.
There are plenty of surf and watersports films made locally, and quite a few cultural documentaries. I particularly recall seeing documentaries on the restoration of Kahoolawe, one on Hokule`a voyaging, and one watersport feature called "Pipeline Masters" that was way more interesting than I thought it would be.
I think whether you would find it a good environment for filmmaking largely depends upon what you're looking for and why you would choose Hawaii in the first place. A recent thread is entitled "Why are there so few movies filmed in Hawaii about average everyday Hawaiians?" (Link:
http://www.city-data.com/forum/hawai...es-filmed.html)
Honolulu has some very talented design, production, and special effects groups, but the islands' remoteness and the lack of a noted, established film community like one might in a select cities stateside (not like LA or NY, but like Austin, Baltimore, or Miami -- or other odd moviemaking hubs) might be challenging. Or crippling. Or inspirational, depending upon how you look at it and how you (plan to) work.
Good luck.