and turn it into a "Main Street" type thing. Brick walkway, an MSU hall of fame, a new store for the Diamond Girls selling all the MSU stuff, maybe a deli like a Lenny's or Peppers or something, try to get bold and put in a sports bar, a kids zone with all that fast pitch and batting cage stuff (even some basketball stuff), a green area with a dog house for Bully on game day, line it with typical stuff like hotdog and ice cream carts.
Oh, and have all this accessible only by ticket on gameday. Sort of like Yawkey Way at Fenway. This will mean building the stadium out to the foul poles as well, but the outfield never gets touched.