I am a first time visitor looking for casual restaurants that best represent New Orleans cuisine. We will be staying in the Garden District, but will have a car, so any part of the city is acceptable. Also, do any of the "finer" dining places have a casual dress code? We like fine dining, but do not want to bring fancy duds. We will be in town for 4 days and will be eating most meals out, so need recommendations for lunch/dinner.