Re: First Trip To The Mothership! Minn at Pitt
You can go to the stadium pretty early, there's always stuff to do/try (your son can try throwing a ball around, or kicking a field goal etc). Some food options outside (think fair type food stands). I believe you can actually enter the stadium 3 hours prior to game time.
Don't have much experience parking wise (as I always come from out of town), but the exodus after the games with the people parking close by seems to be quite the ordeal.
Personally if you're going early to the game, I'd hang around Station Square, maybe grab some food and check out the Incline, then take the ferry across to the game.