Found this question on the Grand Canyon National Park's website. I found the answer quite interesting. For me, I am always looking for an "excuse" to head back to the canyon.
Q: How hard is it to hike into the Grand Canyon?
A: The answer is up to you. Depending on how prepared you are, your trip can be a vacation or a challenge, a revelation or an ordeal. The majority of Grand Canyon hikers are here for the first time, and although many are avid hikers, they find that hiking the Grand Canyon is very different from most other hiking experiences. They tend to react to the experience in one of two ways, either they can't wait to get back, or they swear they will never do it again.