and how do you plan on going to alaska?
if you are riding all the way up I strongly suggest for scenery main road # 3 west through BC north to
smithers then new hazelton and turn north on the cassiar highway ( the best scenic road) via dease lake iskut and the border with yukon where you catch the alaska highway if you decide to visit Atlin lake at that point make a side trip to skagway the road is very scenic.
or go to vancouver and board the ferry inside passage to juneau.