I'm somewhat nervous that there won't be anything to do in Pullman...
What?! Pullman is the bomb. I wish I had not transferred my junior year. If you are sitting around with nothing to do it is your own fault. What I liked about Pullman was that everybody stayed on campus most of the time. At a big school in the city, UW for example, everybody went home on the weekends. Lots of great fishing around Pullman too; the snake as has been noted, the Grand Ronde as well. Take up bird hunting in the fall.
Seriously, if you are not a completet dud with no ability to make friends, you will have a great time. Just don't have too good of a time, know what I mean.
BTW, between Ellensburg and Pullman, obeying the speed limit is a solid idea.
R/
Steve