Actually the idea of sun dresses for the casual dress nights are just perfect, I always take one or two for those nights myself. Just be sure to pack a sweater, the dinning rooms tend to be chilly, although while on Explorer I did not find that problem, but I had one just in case. Also the polo type shirt and dockers for your husband is just what I pack for mine, no problem.
Feel free to post all your questions, someone here will be able to help you out.
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