We were at Denali a couple of weeks ago. Because of the tight schedule the tour has us on we were only able to do the short tour into Denali. It was very rushed and if someone actually spotted anything, the bus driver just kept talking and driving. The ones we talked to who went on the tour all the way into the end of the road, and there is only one road into Denali, all saw wildlife and had time to stop and look. That trip is an all day trip. Good luck.