University of Hawaii Manoa students are being offered free bus transportation today to the 5 p.m. football season-opener at Aloha Stadium against the University of Southern California Trojans.  The buses leave campus at 3:30 p.m. from Dole Street in front of Frear Hall and Gateway House. All buses will return 30 minutes after the end of the game.  Seats are on a first-come, first-served basis. You must have a valid U.H. identification card.