Yes, get your recs! If your friends are getting recs, ask them who they can introduce you to, or contact your local panhellenic. Also, ask your friends' moms if they are greek.
Barring major personality flaws
or body odor
, most chapters will definitely seek out National Merit Scholars. Chapters always want to improve their GPA. I mean, it's not a guarantee, but it will definitely help you...not hurt you at all
Find out as much as you can about rush, find outfits that make you feel great and go in prepared to make lots of friends. I tell people on both sides of rush that when it comes to the rush conversation, all you need to do is make a friend.