Understand this is my PERSONAL view. Don't worry too much about the Federal GFSZ (within 1000' of a school) law. If you abided by it you would never carry anywhere as it requires a CHP and the gun locked away, unloaded, to be in compliance. Just don't be doing something stupid within the zone.
On the off chance that you have confused GFSZ laws with state laws about school property: City streets do not belong to the school; sidewalks may or may not, depending on who installed them. Driving through campus, just follow the advice in first paragraph. Walking through campus, open carrying, you would be asking for trouble. Even if CC, if someone realized you had a gun you could still be in for a hard time.