#3 - Hula Grill at Whaler's Village (Maui) - great location, great view, toes in the sand, nice service, live music, good food, and very affordable. We ate there twice and tried fish 'n chips, Thai chicken pizza and coconut shrimp. We loved the Chili Pepper Water (it's a light sauce) to dip things in, and ended up buying a bottle to bring home. Here's one pic from a sunset after we came off the beach.
#8 - Shrimp Trucks (all over Oahu) - the picture will explain a lot better than words. You can get a whole heaping pile of fresh shrimp and rice for about $12. Not bad. These trucks were scattered about the island. There were a lot on the North Shore side. Giovanni's was a popular one.
Sansaei's Sushi at Napili Beach
Shore Bird Restaurant (at Outrigger Reef on Waikiki Beach)