On a clear day, the best views of Mt. McKinley are along the Parks Highway on the way to Talkeetna and to mile 140 on the Parks highway or along the Petersville Road just north of Talkeetna. In Petersville there are a number of trails plus active gold mines and gold panning areas.
While in Talkeetna, stop by the Denali National Park Climbing Headquarters (907-733-2231).
One can drive via Petersville Road to the edge of the Denali National Park, but there are no facilities or services available on the south side of the Alaska Range. Almost all Park visitors enter from the North side of the Park by the town of Healy which is 3+ hours drive from the Agate Inn. The National Park Service has detailed information on buses, tours and fees.
A flight seeing trip around Mt. McKinley is awesome to say the least. There are several flight services in Palmer, Wasilla and Talkeetna offering flight tours of Mt. McKinley, including Sheldon Air Service (907-733-2321) and Talkeetna Air Taxi (800-533-2219).
Advance reservations are usually not needed. A morning call to flight services to check weather and availability is all you need.
Prices vary from $200 per person to $390 per person depending on flight length and glacier landing options.