you can be in a co-ed (honors, service etc) and NPC or UGC.
http://www.usfugc.com/
www.usfpanhellenic.com
usfgreeklife.com - for all greek life information
Let me know if you have any questions. Like Twinkle555 said, keep your heart and mind open and you will meet some amazing girls in all the organizations here @ USF.