I'm fascinated by the Grand Canyon's scale, have hiked into it several times, including Rim to Rim. It wasn't until a few years ago that I first visited Hawaii and heard about Waimea Canyon, or as it's commonly known, "Grand Canyon of the Pacific". So when Nancy and I had a chance to visit the islands, we made sure to come to Kauai to see and hike down into it. Although there were many similarities, it's on a much smaller scale and the vegetation was incredible! The hike to the bottom and back up was one of the most challenging we've ever done. Temperature was 90+, with mid 90's humidity, and 3000+ feet elevation change within 2.5 miles. Now that we've finished the hike, glad to say we did it.