We had an incredible day touring Yellowstone with Dave, our private guide. He picked us up at our hotel at 6:30 AM and had us back by 4:15. His knowledge and expertise enabled us to see the entire Lower Loop region and learn a lot about not only the sights we saw but the entire ecosystem of the park. He knew the best routes to take to avoid traffic, he knew where the best spots to see animals were, the best viewing spots for the various places we went, an incredible spot for our delicious deli lunch, and even where the best bathrooms were throughout our day. He was courteous and kind and it was well worth the cost of the trip. Highlights included the Upper and Lower Falls (with a short easy hike), the Grand Prismatic Spring (with another short hike), Old Faithful and the historic and beautiful lodge, and lunch on the beautiful Yellowstone Lakeside. We learned about the various rivers that flow through the park, the fires that had burned through the lodgepole pine at various times, the volcano that produced the huge Caldera that Yellowstone sits in, and the different bacteria that produce the many colors throughout the park. We learned about (and saw) the difference between springs, geysers, and mud pots in the thermal areas. Although the wildlife was not as prevalent as we might have hoped, Dave knew the best spots to see various animals, and we did end up seeing bison in multiple spots, a mama bear with two cubs, and a mama elk with 2 babies. There is NO WAY we would have seen all we saw and experienced in one day without Dave! Couldn't recommend this tour highly enough. One suggestion--with customers in all rows of seats in the comfortable Suburban, a microphone would have been helpful.