Swell on Kauai was pretty big the day I went around to the noth-west side (they called it 10-12 foot). The picture of the rolling right handers was a super heavy wave breaking on bare reef/coral. There was a nice left hander (no good for Griz) to the left of this shot that was about 8 foot.
The tranquil pic is where I surfed 2 days after this shot, Anahola Beach, it was up to 6 foot on the sets and beaking very shallow. One guy popped a fin.