In reply to steveb2006:
I have done fantastic multi day hikes in the Brooks Range. September can still be great, when the Tundra turns red and gold (or, with a bit of bad luck, white...). No lodges, though, all camping, Grizzly bear country.
As an easier alternative, the coast south of Anchorage is also worth a visit, there are some good multi day hikes on the Seward peninsula/Kenai Fjords NP. Temperate rainforest, bird migration, beluga whales, bears chasing the salmon run (possibly better in August). IIRC there are a couple of cabins available in summer.
Yukon is probably better by canoe, 10 to 12 days from Whitehorse to Dawson.
CB