You should be able to scalp some tickets before the game for a decent price. Of course that assumes something crazy isn't going on like both teams being undefeated at that point or something...but who are we kidding here.
As far as stuff to do before the game, I'd hike the Y. If that doesn't mean anything to you, just google "hike the Y". It's a fairly short hike (maybe 45 minutes to the top), and it's very close to campus. That'll give you a good flavor for what people like to do around here and will give you some awesome pictures to take home. Do that.