Geyser Hill: http://www.travelwalks.com/Display_Photos.aspx
This list http://yellowstone.net/intro/top-10/ has a short list and each item in the list is a clickable link to more information.
This is a full page 3 day suggested itinerary: http://www.sunset.com/travel/rockies/yellowstone-weekend-activities-00400000050026/
Tripadvisor's top 10 Yellowstone activities: http://www.tripadvisor.com/Attractions-g60999-Activities-c25-Yellowstone_National_Park_Wyoming.html
Yellowstone Wolf Tracker Guided tours are top rated, but the $700 price tag for 14 people is a big ouch. http://www.wolftracker.com/guide.htm
Boiling River is a place where park guests can swim in warm water, even warm enough to swim in the winter.
"We suggest allowing at least 3 days to visit the Park.
#1 Old Faithful Geyser/Upper Basin
#2 Grand Canyon of the Yellowstone
#3 Hayden Valley
#4 Mammoth Hot Springs
#5 Yellowstone Lake
#6 Norris Geyser Basin
#7 Lamar Valley
#8 Tower Fall
#9 Lower Geyser Basin
#10 West Thumb Geyser Basin"#2 Grand Canyon of the Yellowstone
#3 Hayden Valley
#4 Mammoth Hot Springs
#5 Yellowstone Lake
#6 Norris Geyser Basin
#7 Lamar Valley
#8 Tower Fall
#9 Lower Geyser Basin
I hadn't heard of Tower Fall before. Looks interesting: http://yellowstone.net/intro/tower-fall
I still contend that Yellowstone Lake does not look interesting.
Lamar Valley is the top place for wildlife viewing (which includes wolves), so that is on my list.
The paint pots are only interesting when there is water in them to bubble which is primary in the spring during the melt. By September they may be entirely dry.
About the falls in Yellowstone Canyon: "The volume of water flowing over the falls can vary from 63,500 gal/sec at peak runoff to 5,000 gal/sec in the fall."
Great Fountain Geyser is in the Lower Geyser Basin and is "the only major geyser you can truly watch from your windshield. This is especially nice in bad weather." " sits in the middle of one of the prettiest sinter formations in the park. The sinter forms a series of terraced concentric reflecting pools around the geyser. Even if the geyser isn’t erupting, it is worth driving past to see the pools."
Canyon Visitor Education Center gets top marks for interactive displays for the kids which explain the volcanic activity in the area. A&C were pretty interested in the geology of the Hawaiian Volcanoes. Trip Advisor gives this visitor's center top marks: http://www.tripadvisor.com/Attraction_Review-g60999-d774854-Reviews-Canyon_Visitor_Education_Center-Yellowstone_National_Park_Wyoming.html
