Firstly, I would like to note how well National Park Express handled my booking and the ease of rescheduling this particular tour for another date. Not only did they give me enough notice before the original tour date to reschedule, but they also were very upfront with the reasoning for the cancellation (another tour company I had booked with did neither). For our Grand Canyon South Rim tour, we were lucky to get April as our tour guide (we had her last Saturday for Horseshoe Bend and Antelope Canyon) again! She was very informative, entertaining & checked on everyone throughout the tour. We got ample time to explore and get pictures at Mather Point and at Bright Angel to do any trails nearby. Also, we didn't do the guided walking tour as we just wanted to roam freely, however, I think it's likely good to do it if you wanted extra commentary on the side. Once again, the lunch provided was very good as well (filling sandwich and it came with a water, a fruit and a cookie).