Yay! A WSU thread! Please take everything I say with a grain of salt considering I'm an "old" person who hasn't been involved with recruitment for 10 years (though my cousin went through last year, so that helped).
AXOMom really covered most of it, and her experience is more recent than mine, so you should listen to her.
One thing I would recommend is that if you are on facebook, become a fan of WSU Panhellenic (
http://www.facebook.com/#!/WSU.Sororities). They have a good amount of information as well as pictures from last year's recruitment.
Recs are not necessary, but helpful if you can get them. When my cousin went through she had 5, which is an unusually high number for WSU, but ended up joining a house she did not have one to. I remember that when I was active, probably 90% of the women we saw did not have letters to our chapter, and I would think the number would be similar to others.
It is very hot during recruitment. Very very hot. Wear comfortable, cool clothes, and comfrotable shoes.
Keep an open mind, which is good advice for anyone going through recruiment. A decade ago, the "tent talk" was rampant, so it is still good to keep in mind that second hand information is not always the most accurate.
From what I just said, you can probably guess that recruitment is fairly competitive. Expect some cuts, but I don't know anyone who did not get a bid if they kept an open mind. The people who went bidless were generally the ones who limited themselves in some way. Not to say it doesn't happen, I just don't know any examples personally.
As for the residence halls, G/G is great. I was an RA there and lived there as a freshman. The proximity to the Roto Dining Hall is the best location on campus. Just remember that you are on the opposite side of a large hill from the gyms, so as an athletic training major, you may be walking a bit more than you were expecting! Olympia is new since I was there, so I don't know anything about that one unfortunately.
I'm so excited for some WSU recruitment stories this fall! Good luck! GO COUGS!