If you are spending a day at the Grand Canyon - you gotta do this!! I haven't been on a bike on almost 10 years and had a blast. The yellow trails were not difficult and I only had to push my bike up 1 hill. The views are amazing and you can certainly cover more ground on a bike. In fact, I felt kinda sorry for the folks walking the trail. A few spectators even looked a little jealous of our family flying by on our bike. My 8 year old rose behind my husband on a "tag along" bike and loved it. It's inexpensive and well worth it. Have fun!!!!