Kauai's Waimea Canyon and Koke'e State Park are famous for spectacular views, hiking and birding, however you haven't lived until you have sampled the incredible cookie called a Pineapple Cracker sold by the Hawaiians operating the concession stand at one of the big scenic overlooks. Delicate little flowers, in relief, pressed together to form a tiny "sandwich" with a fruit preserve in the center. We hand carried many bags of them home to Alaska. The stand's toasted coconut, taro chips and sweet potato chips are also luscious. All conveniently and prettily packaged in vaccuum sealed packages --- as IF you could resist sampling!
On the North Shore, in Hanalei, the restaurant call Neide's tucked away in shopping center offers mouth-watering Brazilian food (as well as Mexican, however we tried the Brazilian on my husband's birthday), smooth service and fine libations, for what we considered a very fair price.
Also in Hanalei, Postcards offered superb seafood, top notch service and a delightful atmosphere.
On the west side, Waimea area, enjoyed Thai Summer Rolls with oodles of basil, libations, live music and great evening atmosphere at "The Grove"/Waimea Brewing Company connected to the Waimea Plantation Resort.
Take advantage of Farmer's Markets: we did so in Hanalei, Kilauea, and Kalaheo (small but got what we needed) and cooked at home in both Hanalei and Kekaha.