Waimea Canyon is a main feature of Kauai. Most people who visit the island visit Waimea Canyon. Most of those visits only take in a few views from the more popular lookouts. Although carved by water waterfalls are not often seen. Even when they are flowing they are often hidden by the clouds that they came from.
There are many trails in the Waimea Canyon area for more views of the canyon. The Kukui trail even goes to the bottom of the canyon. Just remember that you also have to come back up.