Denali National Park and Preserve is one of those places that you see National Geographic caliber photographs from. To thumb through books about this park does not adequately prepare you for what you will experience first hand. After spending two full days in Denali NP, I think I could spend another two days and still not even scratch the surface.
During our weekend visit, the weather was cooler than average and with quite a bit of drizzle and rain. I don't know what affect the weather had on wildlife sightings, although I must admit that we didn't see nearly as much on the second, rainier day.
During our time visiting Denali, we were blessed by the presence of brown bear (aka grizzlies), moose, caribou, and snowshoe hair. We also saw a quick flash of a fox and a wolf.
Unfortunately, the only real disappointment that we had was not getting to see Mt. McKinley due to cloud cover. The shuttle driver told us to not feel slighted, as only 30% of all park visitors are treated to a full view of the mountain.
Quick Tips:
Be sure to dress warm and in layers. You never really know what to expect regarding the weather. Even within the park, it can change vastly from one end at the park entrance through to the end of the shuttle bus road at Wonder Lake.
Also be sure to take a good quality bug spray as the mosquitoes are thick, big and HUNGRY! Dow Scoggins in his book "Discovering Denali" comments that an average caribou will lose a quart of blood a day to skeeters!
Be sure that you are ready for the photographic opportunities and challenges you will have. The shuttle bus system provided us with decent observations and photo ops, although we had fewer real quality chances during our Tundra Wilderness Tour on the second day. (By the way, we do not recommend it! It is overpriced and shorter as compared with the Wonder Lake Shuttle, the best value!)
Whether you just do the shuttle or a formal bus tour in Denali NP, you will want to be sure to bring plenty of snack type food or even a sandwich . . . and at least two bottles of water. Best Way To Get Around:
As stated above, the shuttle bus system is the way to go. In fact, it is essentially the only way to go. If you are RV camping in the park, with a reservation, you will be permitted to drive into the park to your campsite. Other than that, however, motor vehicles are not permitted on the park's gravel road beyond the Savage River bridge (approximately 14 miles into the park).
I understand that you can cycle in Denali although I don't recall seeing any bikes in the park during our visits. Probably more to do with the weather than anything else.
If you want to do the shuttle and hike around, you will want to start early. While they promote that you can have unlimited "on and off" rights on the shuttle, you may be disappointed if you start too late in the morning. That was the case for us, starting at 9:15am on the Wonder Lake Shuttle.