You cannot go to Kauai without seeing what Mark Twain is accredited with saying is the Pacific’s Grand Canyon. While not as impressive as the Grand Canyon, it is impressive in its' own right. I cannot remember the roads in Arizona, but these roads were narrow and steep, and I am very very glad that I wasn’t doing the driving. And I don’t remember too many guardrails or places to pull off if other cars crowded you!
One thing different about the canyon area now then 12 years ago when I last saw it: less trees since the hurricane destroyed so much. It also appears that a lot of erosion is taking place. Some of the restraining areas where visitors can peer over the rails have been moved because the soil is moving. Something the same is the volume of chickens! They are everywhere. In fact the local people would like the tourists to bring some home!
Also the same from 12 years ago is how awesome the views are. We had a wonderful day, so we were able to drive quite a bit up the mountain and then we stopped at various points on the way down. Since we had a video cam with a very strong zoom lens, we were able to get different perspectives (and pictures) of the canyons. Some of our pictures, taken near the top, show the gravel trails at the bottom. Some show the detail of the "walls" of the canyon. Since several lookout points had multi-tiered viewing areas, we even have pictures where it appears that you are next to the canyon. What our pictures don’t show is how immense the area is. You have to go there to appreciate how huge the area is.
We were lucky that we took our tour at the beginning of the stay. Later in the week as we drove around the island, we could see the canyon area in the distance and cloud covered! Unless you are staying in the Poipu area, it is quite a drive to see one major sightseeing site. But it is worth it and you have to do it.