Did our research and understood the "lower loop" Yellowstone Tour was the better of the two (opposed to upper). We had the 55 & older group, so no kids screaming and running around. Love kids, but appreciated this. Our guide, Alice, was a wonderful guide, took us to a place or two not on the reg tour. She's lived in the area 6 years and kills and dresses out her own elk for winter sustenance. One nice but tough broad! She answered most all our questions and was honest when she didn't have an answer, rarely. Tour bus was a comfy new, Mercedes Benz w retractable top, perfect for this time of year. This is a walking tour w approx 10 or so stops to see the landscape, waterfalls, geysers, and hot springs. etc. There are some steps but it's worth the price for wheelchaired patrons, despite the 10 stops. It seems the ADA is voluntary in Wyoming. Lunch was a basic deli sandwich in picnic setting, meat. cheese and bread, add your own provided condiments as liked. Binoculars were handed out freely to see the wildlife. We saw many bison, birds, a coyote, no moose or deer. Saw Old Faithful (timed just right w/ call to lodge for ETA or it may be a 90 min wait), the incredible log cabin lodge at the site, the beautiful Grand Prismatic Hot Spring, numerous waterfalls. Loved Alice, such a fun guide who loves her job. Ask for her, you won't be disappointed. - FYI- separate note: don't miss the Grand Tetons just south of Yellowstone. Breathtaking! The most amazing site I saw on vacation.