I spent three weeks on Kauai for business. It is my fqvorite island. Very rural still. If wifey doesn't want to do the helicopter tour of Waimea canyon, then drive. The road alone is Friggen fun! I don't remember the name of the place, but we had breakfast nearly every morning at a little shack off the main road around the south side of the island. Think breakfast slam in a bowl. Cheap too. And don't forget a tour of the Kona coffee plantation. If you ride, motorcycle rentals are affordable too.