Indeed, the only place left to play is at Hawaiian Brian's BUT that place has changed so much it is no longer a player's room.
When I was stationed at Kaneohe Bay I used to play at a few other smaller rooms throughout the island as well; including the military base rooms.
Go during the day to Hawaiian Brian's, for the evening is full of loud music.
I was last there in 2012 and the tables were horrible though!
When Rodney Morris was a standout there the action and tournaments were decent.
Honestly though, go to Hawai'i for the beaches and sun not the pool.