I took my family on the south rim tour that included stops at the Hoover Dam and Route 66. Wally was our tour guide and driver, he was excellent! Very knowable, relaxing voice and super sweet. Hover Dam so was for 15-20 minutes, enough to take pictures and see the magnificent structure. The stop on Route 66 was also for 10-15 minutes, enough to relieve yourself and take pictures with cars from the movies Cars. We had 3 hours at the south rim, Wally recommended a trail from the Mader point to the lodge, to see many view points of the south rim... this was a great suggestion. It was a 4Km walk that felt great after the long bus ride. Be warned that if you go in late December/early January that the paved path will be very slippery in parts...I saw a few people slip on the ice and fall while walking the path (they only clear it near the lodge). Bus ride back to Vegas had 1 stop for a bathroom break. While they do supply a lite breakfast and sandwich lunch, I recommend packing food, especially for the ride home (over the dinner hour and to snack on). Overall I highly recommend this tour and to try to get Wally as your driver!