When water turns solid and dusts the ground I show you where there were people around

My first is what cars do when they fast and furiously race through corners. My second is preceded by fire, cedar or cherry. Combined we form a thing that aimlessly floats by.

I dance with the wind where the wide waves roll, A white-winged watcher with a hungry soul. I laugh at the ships and dive for a pull, Guess who I am. the noisy?

a fortress made near the beach and wash away once the tide come to reach

Half a border, half a swine, Yet I am neither by design. Prickly coat but soft inside, I curl to a ball when I hide. What am I?