The restored steam ship, is a great half day well spent as well. Parks Canada did a great job and have some good tours. Nice gift shop as well.
I normally carry a book of Robert Service's poems with me. So I like to take a few hours and go to the banks of the Yukon, there in town. Find a comfortable place to sit and read. It is fun to think that Service himself probably looked at the same view, I am enjoying while there. Now days, I have a copy of his complete works, stored on my Kindle and iPad so one of those go with me. My wife likes to walk the shops downtown while I try to go back in time, in my mind.
Whitehorse to me, is addictive, IMHO. Generally I will tell myself I am just going to stop for fuel and some resupply of groceries and drink, and be on my way north. Then 3 or 4 days later, or more, I will finally head north. Just one of those places that makes me smile to think about it.