Nail Polish
Not many people think about how important nail polish is on your wedding day but it is a key element in showing your style and looking "polished" so to speak because your hands and feet will be photographed throughout the day repeatedly.
One tip I would recommend which I learned the hard way on my wedding day is to test the color ahead of time. Also, I would highly recommend you purchasing your own color so that if chips occur over the long weekend you have a quick fix without more time spent at the salon.
I personally like softer colored nail polish because then the wedding band and engagement ring really shine and you want everyone looking at your rings and not an overpowering polish.