Dottie and I traveled up to Alaska/Yukon in 2002 in a 72 Westy before we became Vanagon folk.

We spent more time in Canada than Alaska.  Our favorites were;

Kenai Peninsula, Alaska

Dawson City, Yukon.  The whole town feels like a gold rush museum.

Dempster highway (Dawson City to Inuvik)

Atlin, BC - worth the 1 hour drive off the main road, especially the glacier tour by small airplane

Top of the World Highway from Dawson City Yukon, to Tok, Alaska

Muncho Lake and Liard River Hotsprings, northern BC

Stewart BC / Hyder Alaska (off of the Cassiar highway coming south)

photo links with silly comments below;
http://www.pauldottrip.com/dawson_city/index.htm
http://www.pauldottrip.com/dempster_inuvik/index.htm
http://www.pauldottrip.com/atlin_bc/index.htm
http://www.pauldottrip.com/Yukon_part2/index.htm
http://www.pauldottrip.com/stewart_hyder/index.htm