Denali is a unique park in many ways.
There is just one road in the park, and traffic on most of it is regulated to prevent congestion, preserve a wilderness experience for sight-seers and reduce stress on wildlife. Travel on the road is mainly limited to a variety of bus trips.
Shuttle buses are not narrated, but they are a great way to see and experience the park. Restroom breaks occur about every 90 minutes, and wildlife viewing stops will occur any time animals can be seen. Passengers are welcome to disembark to hike, either on the road or off-trail in the wilderness, and can board a different bus later in the day to continue their journey.