There’s loads to do in downtown Portland. Take advantage of the free bussing in the downtown area. Go running at the waterfront, hit Saturday Market, take in the nightlife scene (don’t know if you’re over 21), hang at Powell’s, study in the Park Blocks while the weather’s still good.
I was only at PSU one quarter (transferred to OSU), but I found that it was difficult to make friends there, because there are so many commuter students, and non-traditional students with families, etc. Join some clubs on campus right away, and take advantage of the friends-making window when the freshman are all new and looking for other people to hang out with.