The road from Highway 16 through Grande Cache is very nice. There is a sign on hwy 16 that calls it the "scenic route" to Alaska. You will see wildlife, logging trucks and oil field trucks. There are no shoulders, so use caution. My last trip I saw 2 Moose and 2 bear on the road. As big as moose are, you don't see em till the last second.
Your other choice (I'm doing it in July 08) is go west from Jasper and ride the Cassiar north.
On my trip I plan on returning via the Alcan and Grande Cache back to Edmonton