I forgot about the Ulu Factory (I like to say it's literally downstairs from downtown, since there's a big hill with steps heading from 2nd Ave to Ship Creek), and the Alaska Railroad station (this may sound dweeby but the AK RR has the best-looking trains, and this year I actually spent part of a morning chasing after one in an attempt to get a good photo).
There's also the Natural History Museum, which isn't downtown but it's still fairly reachable by bus, and the military museum on 4th Ave (small but nice). Haven't done Sullivan's Steakhouse yet, but only b/c I haven't managed to drag anyone to it and I don't want to eat there alone--it seems like a place where you'd feel lonely if you ate by yourself. If anyone wants to go antiquing (aka "chasing down old race posters/programs/memorabilia/etc"), there's Lazy Dog Antiques in the Fairview neighborhood, which is walkable from downtown if you know which streets are crossable; and Pack Rat Antiques in Spenard (just behind Chilkoot Charlie's, which I haven't been brave enough to go into yet), not to mention a super-upscale place downtown where I managed to get a very nice Audubon "Esquimaux Dogs" image in 2015--long story there.
I sometimes bring people with me (this year, my best friend was going to come with but can't due to family issues). There have also been years when I go up and just "kidnap" tourists as I meet them. "Oh, you're up for the race too? Who's your favorite musher?*...Are you going to the Banquet on Thursday?...I was just about go to Title Wave and see if they added any more rare mushing books to their inventory--wanna come with?" Next thing the tourist knows, he/she is off on an adventure.
* NOTE: the tourist's answer to the question about "favorite musher" often determines if I end up "kidnapping" them or not.