The best thing about hiking in Yellowstone NP is that there are incredible options for all skill levels. For beginner hikes, if you can walk for four to six hours on gentle, mostly flat terrain with little elevation gain, you are good to go! Intermediate trails will see more rocks and other obstacles, with up to 700 ft (215 m) of elevation gain. Advanced hikes cover steep, uneven, and heavily rocky terrain with challenging inclines and 1000 or more feet (300+m) of elevation gain. Keep in mind, the weather in the summer can be very hot and you’ll also be packing a daypack filled with water and other things you’ll need throughout the day.
For wildlife watching, you won’t need to stray too far from the vehicle as wildlife watching is most effective from the road (with short walks to vantage points, up to about a half-mile each). Daily departures are at dawn (5 to 6 am in the summer, 7 am in the winter) and the duration of the tour is typically 7 to 8 hours.