We honeymooned in Maui last November, and would certainly second Howard's nomination of Sansei in Kapalua. While we are both huge sushi fans...some of the other (cooked) seafood dishes looked very innovative. The menu is huge, but signature dishes are noted and the waitstaff are quite helpful. The public beach nearby is fantastic.
In Kaanapali, the fish and chips at the Hula Grill's waterfront (and more casual/less expensive) Barefoot Bar were outstanding. My wife's fruit plate was more exotic than any we had for breakfast elsewhere on the island---and it was more reasonably priced. (Still hungry---then go for dessert next door at Leilani's on the Beach---the signature hula pie, as big as your head, made with macadamia nut ice cream hits the spot).
Though you may not believe us (because I wouldn't have either), BJ's Chicago Pizza (in Lahania) was surprisingly delicious. It was rated among the top ten in the U. S. a few years back (Gourmet?).
The Old Lahania Luau was a good time! Two mai tais did me (a lightweight) in. I got up at dinner to use the bathroom and could not find my way back!!!
The roasted pig smelled a bit like vaseline when they pulled it out of the ground, but tasted mighty good. For a buffet, the food was alright, though you couldn't beat the atmosphere! Ask for the traditional (floor) seating up front, it's more intimate.