This is the person that is moving to Hawaii.
I found some online, you didn't specify what age but nonetheless, the lacrosse programs are 7-18, as there is no high school lacrosse there. Also buying stuff will be incredibly expensive due to the shipping cost.
http://alohalax.org/app/index/list/?org=ALOHALAX.ORGThis from what I looked up is the only youth lacrosse organization that I could find. They serve grades K-12 boys and girls. There are a lot of military children from my understanding.
http://hawaiilacrosse.comThis is an adult league, personally if you want to play. They hold a tournement every year that draws attention from MLL players. A lot of them play recreationally in the tournement.
There is no club lacrosse, but Aloha Lax sends a team to the mainland every year.
Hope you have a nice time.