Does anyone have any suggestions on a restaurant in Kauai that has good food and a nice romantic atmosphere?

Try the Beach House. It has great sunsets and very good food

I second the vote for the Beach House. It has the best location oceanfront of any restaurant on Kauai, by far. The food is very good, the oceanfront atmosphere cannot be beat. The sunsets are a must, so be sure you make reservations and ask for the first seating at sunset about 5:30pm. am. You will absolutely love this restaurant's location and will thoroughly enjoy your evening here.

Another enthusiastic vote for the Beach House restaurant. So lovely and romantic.......I go every year and would not miss it.

Dinner on the terrace in the restaurant at the Princeville Hotel. Incredible. Be sure to get reservations for the early time, then even with reservations, show up about 25 minutes before the doors open to get a table by the balcony. The view is simply lovely.