The park is huge! (2,219,789 acres) Believe it or not the roads only cover about 5% of the park. We managed to explore most of the lower loop and the northeast section including the Lamar Valley. The Lamar Valley is beautiful and a great location to view wildlife. We did not have enough time to see everything and we will definitely plan for a return trip.
Yellowstone is of course known for many geothermal features such as geysers, mud pots, hot springs, and fumaroles. It is estimated that there are 10,000 thermal features in the park. The hot springs and other features may look inviting, but they are very dangerous. Many of the thermal features can reach temperatures of 204 °F and can kill. Make sure to pay attention and stay on the boardwalks. Twenty people have died from these features.
You can also view an abundance of wildlife including Bison, Pronghorn, Marmots, Deer, Elk, and Bear to name a few. We managed to see all of the above.
In addition to thermal features you will also see many extravagant waterfalls.
There is so much to do in Yellowstone National Park, you may want to spend an entire week there.
A trip to Yellowstone would also not be complete without a tour on one of the historic yellow buses. Built in the 1930s they can carry 14 people and they even have wooden doors. They have been recently restored at a cost of $250,000 per bus. This is a tour that you should not miss. We took the Yellowstone Lake Butte Sunset Tour and it was awesome.