Since you are going to be there during milder weather I think capris would be a great choice. Also you won't be sweating either so that is good. We personally change before going out to dinner at signature places but that is just us. It would not bother me to see someone in tennis shoes and capris and a nicer shirt. I hope you enjoy your trip!!!!
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But we considered it our official "special honeymoon dinner" of the trip, so I felt somewhat justified in dressing up a bit.