Seahawk 12K - GO HAWKS! This race has pretty, rolling hills course, and you run around the Seahawks training facility, and players are manning the water stop there. A must for any fan! They also have a 5K the same day that my friend has done and loves, because it is completely flat. No players on the 5K course is the downside, though.
RnR Portland Half - It's not the fact that this is a RnR race that I love. You can do one of those anywhere. What I love about this one is the weather at that time of year (may) and the course. Of course, you can't predict the weather, but the past 2 years have been my ideal running conditions - overcast, 50s, and slightly misty. The course is great, too, because though it climbs up a hill from about miles 4-6, the rest of the course from then on is all gentle downhill, which I love. I've PRed this race both times I've run it, and hope to PR again this year.