Reddit reviews Top Trails Yellowstone & Grand Teton National Parks: Must-Do Hikes for Everyone

The park is BIG and driving about takes time. I always plan to be gone all day when I head out in the morning. So, bring something for lunch, bring plenty to drink. All the visitor areas have food, but, its so much better to sit by a river or valley and eat lunch vs. waiting in line at a snack bar.

I really like this book. It is small and easy to use when driving. It breaks down the loop road into sections and give you highlights of the section referenced.

I like this book also

Binoculars or a spotting scope are great for Yellowstone as there are many long distance vistas.