Making a To Do List for Portland, OR

I'm gathering up a list of things to do and see in Portland, OR. Does anyone have any must see things? Also looking for fun places, bookstores, comic book stores, zine stores, paper stores, toy stores, etc...? We're going to be in Hillsboro (I'm teaching at Art On A Lark), but I'm hoping on Friday to trek into Portland for a bit. We will be driving up from L.A. so if there are places along the way that you'd suggest, I'd love to hear it!

On my list so far-
Powells
Reading Frenzy
Voodoo Donuts

I'd love to hear other ideas-thanks!