My wife and I honeymooned on Mackinac Island and every year when our anniversary comes around I get the urge to go back to the island. There is nothing quite as unique as staying on the island after the crowds have gone home on the last ferry boat. Just the distant sound of the clip-clopping of horses pulling carriages, the hum of bicycle tires on the pavement, the soft sounds of conversation among the folks enjoying an evening on the island. Shops close up for the day and it's just this perfect peaceful quietness that I have never found anywhere else.
I can't wait to go back :).