So.. One very important thing to know about Yellowstone and all its surroundings: even though it seems close- it’s not. The sign says 20 miles, you think “awesome, we’ll get there in 20 minutes!”, no, you won’t. Because you’ll pass traffic, animals, people, more animals, more people and a whole 20-miles trip will become a one hour trip.
Also remember, when traveling by car in Yellowstone, or other parts of Wyoming: have enough gas. What is enough, you ask? Well, try to not go below half of the tank. On our trip, we got to an empty road, straight from King’s horror books, and have been driving for 2 hours, without seeing any gas station, with our gas control getting awfully close to “empty”. That’s the moment when you really know what fear is. And I was told that wasn’t even half as long as it can be in Wyoming.