Fabulous scenery and outdoor opportunties. Good chances to get lost, buried, drowned, and/or eaten by bugs and/or bears. Still less attention from tourists than it deserves, especially in comparison with Alaska locations. Idyllic, in short.
If you're driving there, buy
The Milepost, which you can find at Barnes & Noble, etc. Mile-by-mile descriptions of all highways and other roads in BC, Yukon, and Alaska, plus reliable, detailed info on parks, weather, accommodations, etc. New annual edition appears each March, but any recent one would suffice. You might want to look at it even if you're not driving out. And check out
Yukonbooks.com for books and maps galore.
Be prepared to be amazed.